17 minutes
BUUCTF CRYPTO (3) writeup
同样的味道，同样的感觉，再看密码的世界！
BUUCTF
来审视一下，本次的题目：
题目列表
- Morse
- Cipher
- Dangerous RSA
- basic rsa
- 达芬奇密码
- Checkln
- BabyRSA
- rsa2
- RSA5
- 密码学的心声
- 传感器
- 这是base？
- rot
- Keyboard
- 这是什么
- childRSA
也是同样满满的16道CTF题目，都是密码学题目哟！
0x0 Morse
打开附件，直接就是Morse密码密文：
-..../.----/-..../-..../-..../...--/--.../....-/-..../-..../--.../-.../...--/.----/--.../...--/..---/--.../--.../....-/...../..-./--.../...--/...--/-----/...../..-./...--/...--/...--/....-/...--/...../--.../----./--.../-..
直接解密摩斯密码得到：
61666374667B317327745F73305F333435797D
得到的16进制密文，对密文进行解密：
成功得到flag：
afctf{1s't_s0_345y}
flag：afctf{1s’t_s0_345y}
0x1 Cipher
打开题目描述：
还能提示什么呢？公平的玩吧（密钥自己找） Dncnoqqfliqrpgeklwmppu 注意：得到的 flag 请包上 flag{} 提交, flag{小写字母}
看的非常懵，考察古典密码的题目，唯一的提示就是“公平的玩吧（密钥自己找）”，实在是找不到头绪，看了大佬的WP发现是playfair加密，在网上找到了一个在线工具可以求解playfair加密，这里就使用在线工具进行解密
得到解密结果：Itisnotaproblemhavefun
故得flag: flag{itisnotaproblemhavefun}
0x2 Dangerous RSA
应该是一道典型的RSA题目，直接下载附件
#n: 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
#e: 0x3
#c:0x10652cdfaa6b63f6d7bd1109da08181e500e5643f5b240a9024bfa84d5f2cac9310562978347bb232d63e7289283871efab83d84ff5a7b64a94a79d34cfbd4ef121723ba1f663e514f83f6f01492b4e13e1bb4296d96ea5a353d3bf2edd2f449c03c4a3e995237985a596908adc741f32365
so,how to get the message?
e的值非常小，这道RSA题目应该是考察低加密指数攻击的，直接上脚本：
import gmpy2
import libnum
c = 0x10652cdfaa6b63f6d7bd1109da08181e500e5643f5b240a9024bfa84d5f2cac9310562978347bb232d63e7289283871efab83d84ff5a7b64a94a79d34cfbd4ef121723ba1f663e514f83f6f01492b4e13e1bb4296d96ea5a353d3bf2edd2f449c03c4a3e995237985a596908adc741f32365
n = 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
e = 0x3
m = 0
i = 0
while 1:
if(gmpy2.iroot(c+i*n,3)[1]==1):
m = gmpy2.iroot(c+i*n,3)[0]
break
i += 1
flag = libnum.n2s(m)
print flag
运行脚本，得到flag
flag：flag{25df8caf006ee5db94d48144c33b2c3b}
0x3 basic rsa
应该是RSA加密算法的考察，直接看附件
import gmpy2
from Crypto.Util.number import *
from binascii import a2b_hex,b2a_hex
flag = "*****************"
p = 262248800182277040650192055439906580479
q = 262854994239322828547925595487519915551
e = 65533
n = p*q
c = pow(int(b2a_hex(flag),16),e,n)
print c
# 27565231154623519221597938803435789010285480123476977081867877272451638645710
一个非常简单的加密脚本，简单审计一下就能得到结果。这里使用一个脚本解决：
import gmpy2
import libnum
c = 27565231154623519221597938803435789010285480123476977081867877272451638645710
e = 65533
p = 262248800182277040650192055439906580479
q = 262854994239322828547925595487519915551
n = p*q
phi = (p-1)*(q-1)
d = gmpy2.invert(e,phi)
m = pow(c,d,n)
flag = libnum.n2s(m)
print flag
运行脚本，获得flag
flag：flag{B4by_Rs4}
0x4 达芬奇密码
查看题目描述：
达芬奇一直是一个有争议的画家，科学家。。。小明为了研究他，从网上找到了名画蒙娜丽莎，一天深夜，小明突然从蒙娜丽莎背后的天空中看到了一串神秘的数字。顺带告诉小明达芬奇家窗台上有一串数字是关键。小明千里迢迢找到了这串数字，请将这个送分题做出来，亲，包邮哦（答案是一串32位十进制数字） 注意：得到的 flag 请包上 flag{} 提交
题目应该是和达芬奇有关系，下载附件，查看附件内容
达芬奇隐藏在蒙娜丽莎中的数字列:1 233 3 2584 1346269 144 5 196418 21 1597 610 377 10946 89 514229 987 8 55 6765 2178309 121393 317811 46368 4181 1 832040 2 28657 75025 34 13 17711
记录在达芬奇窗台口的神秘数字串:36968853882116725547342176952286
数字列非常像斐波那契数列，只不过是斐波那契数列进行了乱序而得到的结果。下面的密文应该是根据乱序的结果进行反向乱序得到明文，这里使用一个反乱序的脚本解决：
True_c = '1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597 2584 4181 6765 10946 17711 28657 46368 75025 121393 196418 317811 514229 832040 1346269 2178309'
False_c = '1 233 3 2584 1346269 144 5 196418 21 1597 610 377 10946 89 514229 987 8 55 6765 2178309 121393 317811 46368 4181 1 832040 2 28657 75025 34 13 17711'
cipher = '36968853882116725547342176952286'
True_c = True_c.split(' ')
False_c = False_c.split(' ')
result = ['a']*32
for i in range(len(cipher)):
if(i == 24):
index = 1
else:
index = True_c.index(False_c[i])
result[index] = cipher[i]
for i in result:
print(i,end='')
运行脚本，得到明文
37995588256861228614165223347687
故本题的flag：flag{37995588256861228614165223347687}
0x5 Checkln
直接下载附件，查看附件
dikqTCpfRjA8fUBIMD5GNDkwMjNARkUwI0BFTg==
看样子，密文像是base64加密过的明文，首先尝试进行base64解密得到密文：
v)L_F0<}@H0>F49023@FE0#@EN
如果对这对古典密码熟悉，看到这一段应该就可以识别出这是ROT47加密的密文，使用ROT47进行解密得到FLAG：
GXY{Y0u_kNow_much_about_Rot}
成功得到flag：GXY{Y0u_kNow_much_about_Rot}
0x6 BabyRSA
RSA题目，直接下载附件，查看附件内容：
p+q : 0x1232fecb92adead91613e7d9ae5e36fe6bb765317d6ed38ad890b4073539a6231a6620584cea5730b5af83a3e80cf30141282c97be4400e33307573af6b25e2ea
(p+1)(q+1) : 0x5248becef1d925d45705a7302700d6a0ffe5877fddf9451a9c1181c4d82365806085fd86fbaab08b6fc66a967b2566d743c626547203b34ea3fdb1bc06dd3bb765fd8b919e3bd2cb15bc175c9498f9d9a0e216c2dde64d81255fa4c05a1ee619fc1fc505285a239e7bc655ec6605d9693078b800ee80931a7a0c84f33c851740
e : 0xe6b1bee47bd63f615c7d0a43c529d219
d : 0x2dde7fbaed477f6d62838d55b0d0964868cf6efb2c282a5f13e6008ce7317a24cb57aec49ef0d738919f47cdcd9677cd52ac2293ec5938aa198f962678b5cd0da344453f521a69b2ac03647cdd8339f4e38cec452d54e60698833d67f9315c02ddaa4c79ebaa902c605d7bda32ce970541b2d9a17d62b52df813b2fb0c5ab1a5
enc_flag : 0x50ae00623211ba6089ddfae21e204ab616f6c9d294e913550af3d66e85d0c0693ed53ed55c46d8cca1d7c2ad44839030df26b70f22a8567171a759b76fe5f07b3c5a6ec89117ed0a36c0950956b9cde880c575737f779143f921d745ac3bb0e379c05d9a3cc6bf0bea8aa91e4d5e752c7eb46b2e023edbc07d24a7c460a34a9a
应该是解方程的题目，使用python的sympy库或者sagemath库进行方程求解，这里使用一个脚本就行求解：
import sympy
import libnum
import gmpy2
sum_pq = 0x1232fecb92adead91613e7d9ae5e36fe6bb765317d6ed38ad890b4073539a6231a6620584cea5730b5af83a3e80cf30141282c97be4400e33307573af6b25e2ea
phi_r = 0x5248becef1d925d45705a7302700d6a0ffe5877fddf9451a9c1181c4d82365806085fd86fbaab08b6fc66a967b2566d743c626547203b34ea3fdb1bc06dd3bb765fd8b919e3bd2cb15bc175c9498f9d9a0e216c2dde64d81255fa4c05a1ee619fc1fc505285a239e7bc655ec6605d9693078b800ee80931a7a0c84f33c851740
e = 0xe6b1bee47bd63f615c7d0a43c529d219
d = 0x2dde7fbaed477f6d62838d55b0d0964868cf6efb2c282a5f13e6008ce7317a24cb57aec49ef0d738919f47cdcd9677cd52ac2293ec5938aa198f962678b5cd0da344453f521a69b2ac03647cdd8339f4e38cec452d54e60698833d67f9315c02ddaa4c79ebaa902c605d7bda32ce970541b2d9a17d62b52df813b2fb0c5ab1a5
enc_flag = 0x50ae00623211ba6089ddfae21e204ab616f6c9d294e913550af3d66e85d0c0693ed53ed55c46d8cca1d7c2ad44839030df26b70f22a8567171a759b76fe5f07b3c5a6ec89117ed0a36c0950956b9cde880c575737f779143f921d745ac3bb0e379c05d9a3cc6bf0bea8aa91e4d5e752c7eb46b2e023edbc07d24a7c460a34a9a
p = sympy.Symbol('p')
q = sympy.Symbol('q')
result = sympy.solve([p+q-sum_pq,(p+1)*(q+1)-phi_r])
q = int(result[0][q])
p = int(result[0][p])
n = p*q
m = pow(enc_flag,d,n)
flag = libnum.n2s(m)
print flag
运行脚本，得到flag
flag{cc7490e-78ab-11e9-b422-8ba97e5da1fd}
flag:flag{cc7490e-78ab-11e9-b422-8ba97e5da1fd}
0x7 rsa2
RSA题目，看看这次又有什么花样吧！直接下载附件，查看附件
N = 101991809777553253470276751399264740131157682329252673501792154507006158434432009141995367241962525705950046253400188884658262496534706438791515071885860897552736656899566915731297225817250639873643376310103992170646906557242832893914902053581087502512787303322747780420210884852166586717636559058152544979471
e = 46731919563265721307105180410302518676676135509737992912625092976849075262192092549323082367518264378630543338219025744820916471913696072050291990620486581719410354385121760761374229374847695148230596005409978383369740305816082770283909611956355972181848077519920922059268376958811713365106925235218265173085
import hashlib
flag = "flag{" + hashlib.md5(hex(d)).hexdigest() + "}"
附件是一个python程序，简单审计一下，发现e的数值有不太正常，有些过大。应该是RSA低解密指数，采用rsa-wiener-attack算法可以攻击得到d，拉一些github上的rsa-wiener-attack仓库，使用一个脚本解决：
import RSAwienerHacker
import hashlib
n = 101991809777553253470276751399264740131157682329252673501792154507006158434432009141995367241962525705950046253400188884658262496534706438791515071885860897552736656899566915731297225817250639873643376310103992170646906557242832893914902053581087502512787303322747780420210884852166586717636559058152544979471
e = 46731919563265721307105180410302518676676135509737992912625092976849075262192092549323082367518264378630543338219025744820916471913696072050291990620486581719410354385121760761374229374847695148230596005409978383369740305816082770283909611956355972181848077519920922059268376958811713365106925235218265173085
test_d = RSAwienerHacker.hack_RSA(e, n)
if test_d:
d = test_d
flag = "flag{" + hashlib.md5(hex(d)).hexdigest()+"}"
print flag
运行脚本，得到flag：
flag{47bf28da384590448e0b0d23909a25a4}
flag:flag{47bf28da384590448e0b0d23909a25a4}
0x8 RSA5
RSA题目，看看这次又有什么有意思的变化，下载附件，查看附件：
m = xxxxxxxx
e = 65537
========== n c ==========
n = 20474918894051778533305262345601880928088284471121823754049725354072477155873778848055073843345820697886641086842612486541250183965966001591342031562953561793332341641334302847996108417466360688139866505179689516589305636902137210185624650854906780037204412206309949199080005576922775773722438863762117750429327585792093447423980002401200613302943834212820909269713876683465817369158585822294675056978970612202885426436071950214538262921077409076160417436699836138801162621314845608796870206834704116707763169847387223307828908570944984416973019427529790029089766264949078038669523465243837675263858062854739083634207
c = 974463908243330865728978769213595400782053398596897741316275722596415018912929508637393850919224969271766388710025195039896961956062895570062146947736340342927974992616678893372744261954172873490878805483241196345881721164078651156067119957816422768524442025688079462656755605982104174001635345874022133045402344010045961111720151990412034477755851802769069309069018738541854130183692204758761427121279982002993939745343695671900015296790637464880337375511536424796890996526681200633086841036320395847725935744757993013352804650575068136129295591306569213300156333650910795946800820067494143364885842896291126137320
n = 20918819960648891349438263046954902210959146407860980742165930253781318759285692492511475263234242002509419079545644051755251311392635763412553499744506421566074721268822337321637265942226790343839856182100575539845358877493718334237585821263388181126545189723429262149630651289446553402190531135520836104217160268349688525168375213462570213612845898989694324269410202496871688649978370284661017399056903931840656757330859626183773396574056413017367606446540199973155630466239453637232936904063706551160650295031273385619470740593510267285957905801566362502262757750629162937373721291789527659531499435235261620309759
c = 15819636201971185538694880505120469332582151856714070824521803121848292387556864177196229718923770810072104155432038682511434979353089791861087415144087855679134383396897817458726543883093567600325204596156649305930352575274039425470836355002691145864435755333821133969266951545158052745938252574301327696822347115053614052423028835532509220641378760800693351542633860702225772638930501021571415907348128269681224178300248272689705308911282208685459668200507057183420662959113956077584781737983254788703048275698921427029884282557468334399677849962342196140864403989162117738206246183665814938783122909930082802031855
n = 25033254625906757272369609119214202033162128625171246436639570615263949157363273213121556825878737923265290579551873824374870957467163989542063489416636713654642486717219231225074115269684119428086352535471683359486248203644461465935500517901513233739152882943010177276545128308412934555830087776128355125932914846459470221102007666912211992310538890654396487111705385730502843589727289829692152177134753098649781412247065660637826282055169991824099110916576856188876975621376606634258927784025787142263367152947108720757222446686415627479703666031871635656314282727051189190889008763055811680040315277078928068816491
c = 4185308529416874005831230781014092407198451385955677399668501833902623478395669279404883990725184332709152443372583701076198786635291739356770857286702107156730020004358955622511061410661058982622055199736820808203841446796305284394651714430918690389486920560834672316158146453183789412140939029029324756035358081754426645160033262924330248675216108270980157049705488620263485129480952814764002865280019185127662449318324279383277766416258142275143923532168798413011028271543085249029048997452212503111742302302065401051458066585395360468447460658672952851643547193822775218387853623453638025492389122204507555908862
n = 21206968097314131007183427944486801953583151151443627943113736996776787181111063957960698092696800555044199156765677935373149598221184792286812213294617749834607696302116136745662816658117055427803315230042700695125718401646810484873064775005221089174056824724922160855810527236751389605017579545235876864998419873065217294820244730785120525126565815560229001887622837549118168081685183371092395128598125004730268910276024806808565802081366898904032509920453785997056150497645234925528883879419642189109649009132381586673390027614766605038951015853086721168018787523459264932165046816881682774229243688581614306480751
c = 4521038011044758441891128468467233088493885750850588985708519911154778090597136126150289041893454126674468141393472662337350361712212694867311622970440707727941113263832357173141775855227973742571088974593476302084111770625764222838366277559560887042948859892138551472680654517814916609279748365580610712259856677740518477086531592233107175470068291903607505799432931989663707477017904611426213770238397005743730386080031955694158466558475599751940245039167629126576784024482348452868313417471542956778285567779435940267140679906686531862467627238401003459101637191297209422470388121802536569761414457618258343550613
n = 22822039733049388110936778173014765663663303811791283234361230649775805923902173438553927805407463106104699773994158375704033093471761387799852168337898526980521753614307899669015931387819927421875316304591521901592823814417756447695701045846773508629371397013053684553042185725059996791532391626429712416994990889693732805181947970071429309599614973772736556299404246424791660679253884940021728846906344198854779191951739719342908761330661910477119933428550774242910420952496929605686154799487839923424336353747442153571678064520763149793294360787821751703543288696726923909670396821551053048035619499706391118145067
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c = 3834917098887202931981968704659119341624432294759361919553937551053499607440333234018189141970246302299385742548278589896033282894981200353270637127213483172182529890495903425649116755901631101665876301799865612717750360089085179142750664603454193642053016384714515855868368723508922271767190285521137785688075622832924829248362774476456232826885801046969384519549385428259591566716890844604696258783639390854153039329480726205147199247183621535172450825979047132495439603840806501254997167051142427157381799890725323765558803808030109468048682252028720241357478614704610089120810367192414352034177484688502364022887
n = 19254242571588430171308191757871261075358521158624745702744057556054652332495961196795369630484782930292003238730267396462491733557715379956969694238267908985251699834707734400775311452868924330866502429576951934279223234676654749272932769107390976321208605516299532560054081301829440688796904635446986081691156842271268059970762004259219036753174909942343204432795076377432107630203621754552804124408792358220071862369443201584155711893388877350138023238624566616551246804054720492816226651467017802504094070614892556444425915920269485861799532473383304622064493223627552558344088839860178294589481899206318863310603
c = 6790553533991297205804561991225493105312398825187682250780197510784765226429663284220400480563039341938599783346724051076211265663468643826430109013245014035811178295081939958687087477312867720289964506097819762095244479129359998867671811819738196687884696680463458661374310994610760009474264115750204920875527434486437536623589684519411519100170291423367424938566820315486507444202022408003879118465761273916755290898112991525546114191064022991329724370064632569903856189236177894007766690782630247443895358893983735822824243487181851098787271270256780891094405121947631088729917398317652320497765101790132679171889
n = 26809700251171279102974962949184411136459372267620535198421449833298448092580497485301953796619185339316064387798092220298630428207556482805739803420279056191194360049651767412572609187680508073074653291350998253938793269214230457117194434853888765303403385824786231859450351212449404870776320297419712486574804794325602760347306432927281716160368830187944940128907971027838510079519466846176106565164730963988892400240063089397720414921398936399927948235195085202171264728816184532651138221862240969655185596628285814057082448321749567943946273776184657698104465062749244327092588237927996419620170254423837876806659
c = 386213556608434013769864727123879412041991271528990528548507451210692618986652870424632219424601677524265011043146748309774067894985069288067952546139416819404039688454756044862784630882833496090822568580572859029800646671301748901528132153712913301179254879877441322285914544974519727307311002330350534857867516466612474769753577858660075830592891403551867246057397839688329172530177187042229028685862036140779065771061933528137423019407311473581832405899089709251747002788032002094495379614686544672969073249309703482556386024622814731015767810042969813752548617464974915714425595351940266077021672409858645427346
观察附件中的数据信息，发现有很多组n，c数据，应该是广播攻击。低加密指数广播攻击，是采用欧几里得算法对多组数据进行求解。这里使用一个脚本求解：
import gmpy2
import libnum
m = 0
e = 65537
n1 = 20474918894051778533305262345601880928088284471121823754049725354072477155873778848055073843345820697886641086842612486541250183965966001591342031562953561793332341641334302847996108417466360688139866505179689516589305636902137210185624650854906780037204412206309949199080005576922775773722438863762117750429327585792093447423980002401200613302943834212820909269713876683465817369158585822294675056978970612202885426436071950214538262921077409076160417436699836138801162621314845608796870206834704116707763169847387223307828908570944984416973019427529790029089766264949078038669523465243837675263858062854739083634207
c1 = 974463908243330865728978769213595400782053398596897741316275722596415018912929508637393850919224969271766388710025195039896961956062895570062146947736340342927974992616678893372744261954172873490878805483241196345881721164078651156067119957816422768524442025688079462656755605982104174001635345874022133045402344010045961111720151990412034477755851802769069309069018738541854130183692204758761427121279982002993939745343695671900015296790637464880337375511536424796890996526681200633086841036320395847725935744757993013352804650575068136129295591306569213300156333650910795946800820067494143364885842896291126137320
n2 = 20918819960648891349438263046954902210959146407860980742165930253781318759285692492511475263234242002509419079545644051755251311392635763412553499744506421566074721268822337321637265942226790343839856182100575539845358877493718334237585821263388181126545189723429262149630651289446553402190531135520836104217160268349688525168375213462570213612845898989694324269410202496871688649978370284661017399056903931840656757330859626183773396574056413017367606446540199973155630466239453637232936904063706551160650295031273385619470740593510267285957905801566362502262757750629162937373721291789527659531499435235261620309759
c2 = 15819636201971185538694880505120469332582151856714070824521803121848292387556864177196229718923770810072104155432038682511434979353089791861087415144087855679134383396897817458726543883093567600325204596156649305930352575274039425470836355002691145864435755333821133969266951545158052745938252574301327696822347115053614052423028835532509220641378760800693351542633860702225772638930501021571415907348128269681224178300248272689705308911282208685459668200507057183420662959113956077584781737983254788703048275698921427029884282557468334399677849962342196140864403989162117738206246183665814938783122909930082802031855
n3 = 25033254625906757272369609119214202033162128625171246436639570615263949157363273213121556825878737923265290579551873824374870957467163989542063489416636713654642486717219231225074115269684119428086352535471683359486248203644461465935500517901513233739152882943010177276545128308412934555830087776128355125932914846459470221102007666912211992310538890654396487111705385730502843589727289829692152177134753098649781412247065660637826282055169991824099110916576856188876975621376606634258927784025787142263367152947108720757222446686415627479703666031871635656314282727051189190889008763055811680040315277078928068816491
c3 = 4185308529416874005831230781014092407198451385955677399668501833902623478395669279404883990725184332709152443372583701076198786635291739356770857286702107156730020004358955622511061410661058982622055199736820808203841446796305284394651714430918690389486920560834672316158146453183789412140939029029324756035358081754426645160033262924330248675216108270980157049705488620263485129480952814764002865280019185127662449318324279383277766416258142275143923532168798413011028271543085249029048997452212503111742302302065401051458066585395360468447460658672952851643547193822775218387853623453638025492389122204507555908862
n4 = 21206968097314131007183427944486801953583151151443627943113736996776787181111063957960698092696800555044199156765677935373149598221184792286812213294617749834607696302116136745662816658117055427803315230042700695125718401646810484873064775005221089174056824724922160855810527236751389605017579545235876864998419873065217294820244730785120525126565815560229001887622837549118168081685183371092395128598125004730268910276024806808565802081366898904032509920453785997056150497645234925528883879419642189109649009132381586673390027614766605038951015853086721168018787523459264932165046816881682774229243688581614306480751
c4 = 4521038011044758441891128468467233088493885750850588985708519911154778090597136126150289041893454126674468141393472662337350361712212694867311622970440707727941113263832357173141775855227973742571088974593476302084111770625764222838366277559560887042948859892138551472680654517814916609279748365580610712259856677740518477086531592233107175470068291903607505799432931989663707477017904611426213770238397005743730386080031955694158466558475599751940245039167629126576784024482348452868313417471542956778285567779435940267140679906686531862467627238401003459101637191297209422470388121802536569761414457618258343550613
n5 = 22822039733049388110936778173014765663663303811791283234361230649775805923902173438553927805407463106104699773994158375704033093471761387799852168337898526980521753614307899669015931387819927421875316304591521901592823814417756447695701045846773508629371397013053684553042185725059996791532391626429712416994990889693732805181947970071429309599614973772736556299404246424791660679253884940021728846906344198854779191951739719342908761330661910477119933428550774242910420952496929605686154799487839923424336353747442153571678064520763149793294360787821751703543288696726923909670396821551053048035619499706391118145067
c5 = 15406498580761780108625891878008526815145372096234083936681442225155097299264808624358826686906535594853622687379268969468433072388149786607395396424104318820879443743112358706546753935215756078345959375299650718555759698887852318017597503074317356745122514481807843745626429797861463012940172797612589031686718185390345389295851075279278516147076602270178540690147808314172798987497259330037810328523464851895621851859027823681655934104713689539848047163088666896473665500158179046196538210778897730209572708430067658411755959866033531700460551556380993982706171848970460224304996455600503982223448904878212849412357
n6 = 21574139855341432908474064784318462018475296809327285532337706940126942575349507668289214078026102682252713757703081553093108823214063791518482289846780197329821139507974763780260290309600884920811959842925540583967085670848765317877441480914852329276375776405689784571404635852204097622600656222714808541872252335877037561388406257181715278766652824786376262249274960467193961956690974853679795249158751078422296580367506219719738762159965958877806187461070689071290948181949561254144310776943334859775121650186245846031720507944987838489723127897223416802436021278671237227993686791944711422345000479751187704426369
c6 = 20366856150710305124583065375297661819795242238376485264951185336996083744604593418983336285185491197426018595031444652123288461491879021096028203694136683203441692987069563513026001861435722117985559909692670907347563594578265880806540396777223906955491026286843168637367593400342814725694366078337030937104035993569672959361347287894143027186846856772983058328919716702982222142848848117768499996617588305301483085428547267337070998767412540225911508196842253134355901263861121500650240296746702967594224401650220168780537141654489215019142122284308116284129004257364769474080721001708734051264841350424152506027932
n7 = 25360227412666612490102161131174584819240931803196448481224305250583841439581008528535930814167338381983764991296575637231916547647970573758269411168219302370541684789125112505021148506809643081950237623703181025696585998044695691322012183660424636496897073045557400768745943787342548267386564625462143150176113656264450210023925571945961405709276631990731602198104287528528055650050486159837612279600415259486306154947514005408907590083747758953115486124865486720633820559135063440942528031402951958557630833503775112010715604278114325528993771081233535247118481765852273252404963430792898948219539473312462979849137
c7 = 19892772524651452341027595619482734356243435671592398172680379981502759695784087900669089919987705675899945658648623800090272599154590123082189645021800958076861518397325439521139995652026377132368232502108620033400051346127757698623886142621793423225749240286511666556091787851683978017506983310073524398287279737680091787333547538239920607761080988243639547570818363788673249582783015475682109984715293163137324439862838574460108793714172603672477766831356411304446881998674779501188163600664488032943639694828698984739492200699684462748922883550002652913518229322945040819064133350314536378694523704793396169065179
n8 = 22726855244632356029159691753451822163331519237547639938779517751496498713174588935566576167329576494790219360727877166074136496129927296296996970048082870488804456564986667129388136556137013346228118981936899510687589585286517151323048293150257036847475424044378109168179412287889340596394755257704938006162677656581509375471102546261355748251869048003600520034656264521931808651038524134185732929570384705918563982065684145766427962502261522481994191989820110575981906998431553107525542001187655703534683231777988419268338249547641335718393312295800044734534761692799403469497954062897856299031257454735945867491191
c8 = 6040119795175856407541082360023532204614723858688636724822712717572759793960246341800308149739809871234313049629732934797569781053000686185666374833978403290525072598774001731350244744590772795701065129561898116576499984185920661271123665356132719193665474235596884239108030605882777868856122378222681140570519180321286976947154042272622411303981011302586225630859892731724640574658125478287115198406253847367979883768000812605395482952698689604477719478947595442185921480652637868335673233200662100621025061500895729605305665864693122952557361871523165300206070325660353095592778037767395360329231331322823610060006
n9 = 23297333791443053297363000786835336095252290818461950054542658327484507406594632785712767459958917943095522594228205423428207345128899745800927319147257669773812669542782839237744305180098276578841929496345963997512244219376701787616046235397139381894837435562662591060768476997333538748065294033141610502252325292801816812268934171361934399951548627267791401089703937389012586581080223313060159456238857080740699528666411303029934807011214953984169785844714159627792016926490955282697877141614638806397689306795328344778478692084754216753425842557818899467945102646776342655167655384224860504086083147841252232760941
c9 = 5418120301208378713115889465579964257871814114515046096090960159737859076829258516920361577853903925954198406843757303687557848302302200229295916902430205737843601806700738234756698575708612424928480440868739120075888681672062206529156566421276611107802917418993625029690627196813830326369874249777619239603300605876865967515719079797115910578653562787899019310139945904958024882417833736304894765433489476234575356755275147256577387022873348906900149634940747104513850154118106991137072643308620284663108283052245750945228995387803432128842152251549292698947407663643895853432650029352092018372834457054271102816934
n10 = 28873667904715682722987234293493200306976947898711255064125115933666968678742598858722431426218914462903521596341771131695619382266194233561677824357379805303885993804266436810606263022097900266975250431575654686915049693091467864820512767070713267708993899899011156106766178906700336111712803362113039613548672937053397875663144794018087017731949087794894903737682383916173267421403408140967713071026001874733487295007501068871044649170615709891451856792232315526696220161842742664778581287321318748202431466508948902745314372299799561625186955234673012098210919745879882268512656931714326782335211089576897310591491
c10 = 9919880463786836684987957979091527477471444996392375244075527841865509160181666543016317634963512437510324198702416322841377489417029572388474450075801462996825244657530286107428186354172836716502817609070590929769261932324275353289939302536440310628698349244872064005700644520223727670950787924296004296883032978941200883362653993351638545860207179022472492671256630427228461852668118035317021428675954874947015197745916918197725121122236369382741533983023462255913924692806249387449016629865823316402366017657844166919846683497851842388058283856219900535567427103603869955066193425501385255322097901531402103883869
n11 = 22324685947539653722499932469409607533065419157347813961958075689047690465266404384199483683908594787312445528159635527833904475801890381455653807265501217328757871352731293000303438205315816792663917579066674842307743845261771032363928568844669895768092515658328756229245837025261744260614860746997931503548788509983868038349720225305730985576293675269073709022350700836510054067641753713212999954307022524495885583361707378513742162566339010134354907863733205921845038918224463903789841881400814074587261720283879760122070901466517118265422863420376921536734845502100251460872499122236686832189549698020737176683019
c11 = 1491527050203294989882829248560395184804977277747126143103957219164624187528441047837351263580440686474767380464005540264627910126483129930668344095814547592115061057843470131498075060420395111008619027199037019925701236660166563068245683975787762804359520164701691690916482591026138582705558246869496162759780878437137960823000043988227303003876410503121370163303711603359430764539337597866862508451528158285103251810058741879687875218384160282506172706613359477657215420734816049393339593755489218588796607060261897905233453268671411610631047340459487937479511933450369462213795738933019001471803157607791738538467
n12 = 27646746423759020111007828653264027999257847645666129907789026054594393648800236117046769112762641778865620892443423100189619327585811384883515424918752749559627553637785037359639801125213256163008431942593727931931898199727552768626775618479833029101249692573716030706695702510982283555740851047022672485743432464647772882314215176114732257497240284164016914018689044557218920300262234652840632406067273375269301008409860193180822366735877288205783314326102263756503786736122321348320031950012144905869556204017430593656052867939493633163499580242224763404338807022510136217187779084917996171602737036564991036724299
c12 = 21991524128957260536043771284854920393105808126700128222125856775506885721971193109361315961129190814674647136464887087893990660894961612838205086401018885457667488911898654270235561980111174603323721280911197488286585269356849579263043456316319476495888696219344219866516861187654180509247881251251278919346267129904739277386289240394384575124331135655943513831009934023397457082184699737734388823763306805326430395849935770213817533387235486307008892410920611669932693018165569417445885810825749609388627231235840912644654685819620931663346297596334834498661789016450371769203650109994771872404185770230172934013971
n13 = 20545487405816928731738988374475012686827933709789784391855706835136270270933401203019329136937650878386117187776530639342572123237188053978622697282521473917978282830432161153221216194169879669541998840691383025487220850872075436064308499924958517979727954402965612196081404341651517326364041519250125036424822634354268773895465698920883439222996581226358595873993976604699830613932320720554130011671297944433515047180565484495191003887599891289037982010216357831078328159028953222056918189365840711588671093333013117454034313622855082795813122338562446223041211192277089225078324682108033843023903550172891959673551
c13 = 14227439188191029461250476692790539654619199888487319429114414557975376308688908028140817157205579804059783807641305577385724758530138514972962209062230576107406142402603484375626077345190883094097636019771377866339531511965136650567412363889183159616188449263752475328663245311059988337996047359263288837436305588848044572937759424466586870280512424336807064729894515840552404756879590698797046333336445465120445087587621743906624279621779634772378802959109714400516183718323267273824736540168545946444437586299214110424738159957388350785999348535171553569373088251552712391288365295267665691357719616011613628772175
n14 = 27359727711584277234897157724055852794019216845229798938655814269460046384353568138598567755392559653460949444557879120040796798142218939251844762461270251672399546774067275348291003962551964648742053215424620256999345448398805278592777049668281558312871773979931343097806878701114056030041506690476954254006592555275342579529625231194321357904668512121539514880704046969974898412095675082585315458267591016734924646294357666924293908418345508902112711075232047998775303603175363964055048589769318562104883659754974955561725694779754279606726358588862479198815999276839234952142017210593887371950645418417355912567987
c14 = 3788529784248255027081674540877016372807848222776887920453488878247137930578296797437647922494510483767651150492933356093288965943741570268943861987024276610712717409139946409513963043114463933146088430004237747163422802959250296602570649363016151581364006795894226599584708072582696996740518887606785460775851029814280359385763091078902301957226484620428513604630585131511167015763190591225884202772840456563643159507805711004113901417503751181050823638207803533111429510911616160851391754754434764819568054850823810901159821297849790005646102129354035735350124476838786661542089045509656910348676742844957008857457
n15 = 27545937603751737248785220891735796468973329738076209144079921449967292572349424539010502287564030116831261268197384650511043068738911429169730640135947800885987171539267214611907687570587001933829208655100828045651391618089603288456570334500533178695238407684702251252671579371018651675054368606282524673369983034682330578308769886456335818733827237294570476853673552685361689144261552895758266522393004116017849397346259119221063821663280935820440671825601452417487330105280889520007917979115568067161590058277418371493228631232457972494285014767469893647892888681433965857496916110704944758070268626897045014782837
c15 = 14069112970608895732417039977542732665796601893762401500878786871680645798754783315693511261740059725171342404186571066972546332813667711135661176659424619936101038903439144294886379322591635766682645179888058617577572409307484708171144488708410543462972008179994594087473935638026612679389759756811490524127195628741262871304427908481214992471182859308828778119005750928935764927967212343526503410515793717201360360437981322576798056276657140363332700714732224848346808963992302409037706094588964170239521193589470070839790404597252990818583717869140229811712295005710540476356743378906642267045723633874011649259842
n16 = 25746162075697911560263181791216433062574178572424600336856278176112733054431463253903433128232709054141607100891177804285813783247735063753406524678030561284491481221681954564804141454666928657549670266775659862814924386584148785453647316864935942772919140563506305666207816897601862713092809234429096584753263707828899780979223118181009293655563146526792388913462557306433664296966331469906428665127438829399703002867800269947855869262036714256550075520193125987011945192273531732276641728008406855871598678936585324782438668746810516660152018244253008092470066555687277138937298747951929576231036251316270602513451
c16 = 17344284860275489477491525819922855326792275128719709401292545608122859829827462088390044612234967551682879954301458425842831995513832410355328065562098763660326163262033200347338773439095709944202252494552172589503915965931524326523663289777583152664722241920800537867331030623906674081852296232306336271542832728410803631170229642717524942332390842467035143631504401140727083270732464237443915263865880580308776111219718961746378842924644142127243573824972533819479079381023103585862099063382129757560124074676150622288706094110075567706403442920696472627797607697962873026112240527498308535903232663939028587036724
n17 = 23288486934117120315036919418588136227028485494137930196323715336208849327833965693894670567217971727921243839129969128783853015760155446770590696037582684845937132790047363216362087277861336964760890214059732779383020349204803205725870225429985939570141508220041286857810048164696707018663758416807708910671477407366098883430811861933014973409390179948577712579749352299440310543689035651465399867908428885541237776143404376333442949397063249223702355051571790555151203866821867908531733788784978667478707672984539512431549558672467752712004519300318999208102076732501412589104904734983789895358753664077486894529499
c17 = 10738254418114076548071448844964046468141621740603214384986354189105236977071001429271560636428075970459890958274941762528116445171161040040833357876134689749846940052619392750394683504816081193432350669452446113285638982551762586656329109007214019944975816434827768882704630460001209452239162896576191876324662333153835533956600295255158377025198426950944040643235430211011063586032467724329735785947372051759042138171054165854842472990583800899984893232549092766400510300083585513014171220423103452292891496141806956300396540682381668367564569427813092064053993103537635994311143010708814851867239706492577203899024
n18 = 19591441383958529435598729113936346657001352578357909347657257239777540424811749817783061233235817916560689138344041497732749011519736303038986277394036718790971374656832741054547056417771501234494768509780369075443550907847298246275717420562375114406055733620258777905222169702036494045086017381084272496162770259955811174440490126514747876661317750649488774992348005044389081101686016446219264069971370646319546429782904810063020324704138495608761532563310699753322444871060383693044481932265801505819646998535192083036872551683405766123968487907648980900712118052346174533513978009131757167547595857552370586353973
c18 = 3834917098887202931981968704659119341624432294759361919553937551053499607440333234018189141970246302299385742548278589896033282894981200353270637127213483172182529890495903425649116755901631101665876301799865612717750360089085179142750664603454193642053016384714515855868368723508922271767190285521137785688075622832924829248362774476456232826885801046969384519549385428259591566716890844604696258783639390854153039329480726205147199247183621535172450825979047132495439603840806501254997167051142427157381799890725323765558803808030109468048682252028720241357478614704610089120810367192414352034177484688502364022887
n19 = 19254242571588430171308191757871261075358521158624745702744057556054652332495961196795369630484782930292003238730267396462491733557715379956969694238267908985251699834707734400775311452868924330866502429576951934279223234676654749272932769107390976321208605516299532560054081301829440688796904635446986081691156842271268059970762004259219036753174909942343204432795076377432107630203621754552804124408792358220071862369443201584155711893388877350138023238624566616551246804054720492816226651467017802504094070614892556444425915920269485861799532473383304622064493223627552558344088839860178294589481899206318863310603
c19 = 6790553533991297205804561991225493105312398825187682250780197510784765226429663284220400480563039341938599783346724051076211265663468643826430109013245014035811178295081939958687087477312867720289964506097819762095244479129359998867671811819738196687884696680463458661374310994610760009474264115750204920875527434486437536623589684519411519100170291423367424938566820315486507444202022408003879118465761273916755290898112991525546114191064022991329724370064632569903856189236177894007766690782630247443895358893983735822824243487181851098787271270256780891094405121947631088729917398317652320497765101790132679171889
n20 = 26809700251171279102974962949184411136459372267620535198421449833298448092580497485301953796619185339316064387798092220298630428207556482805739803420279056191194360049651767412572609187680508073074653291350998253938793269214230457117194434853888765303403385824786231859450351212449404870776320297419712486574804794325602760347306432927281716160368830187944940128907971027838510079519466846176106565164730963988892400240063089397720414921398936399927948235195085202171264728816184532651138221862240969655185596628285814057082448321749567943946273776184657698104465062749244327092588237927996419620170254423837876806659
c20 = 386213556608434013769864727123879412041991271528990528548507451210692618986652870424632219424601677524265011043146748309774067894985069288067952546139416819404039688454756044862784630882833496090822568580572859029800646671301748901528132153712913301179254879877441322285914544974519727307311002330350534857867516466612474769753577858660075830592891403551867246057397839688329172530177187042229028685862036140779065771061933528137423019407311473581832405899089709251747002788032002094495379614686544672969073249309703482556386024622814731015767810042969813752548617464974915714425595351940266077021672409858645427346
n = [n1, n2, n3, n4, n5, n6, n7, n8, n9, n10, n11, n12, n13, n14, n15, n16, n17,
n18, n19, n20]
c = [c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, c11, c12, c13, c14, c15, c16, c17,
c18, c19, c20]
for i in range(len(n)):
for j in range(len(n)):
if(i!=j):
if(gmpy2.gcd(n[i],n[j])!=1):
p = gmpy2.gcd(n[i],n[j])
q = n[i] // p
d = gmpy2.invert(e , (p-1)*(q-1))
m = pow(c[i],d,n[i])
flag = libnum.n2s(int(m))
print flag
运行脚本，得到flag:
flag{abdcbe5fd94e23b3de429223ab9c2fdf}
flag:flag{abdcbe5fd94e23b3de429223ab9c2fdf}
0x9 密码学的心声
看题目应该是挺有意思的题目，看看题目描述：
二战时期，某国军官与一个音乐家情妇相好，然而自从那时起，他屡战屡败，敌人似乎料事如神。他也有怀疑过他的情妇，但是他经过24小时观察他的情妇，发现她每天都只是作曲，然后弹奏给战地电台，为士兵们鼓气，并未有任何逾越。那么，间谍到底是谁？这张曲谱是否有猫腻？ (答案为一个明文字符串，提交获得的有意义语句通顺字符串即可) 注意：得到的 flag 请包上 flag{} 提交
下载附件，查看附件内容：
附件内容
发现，附件是一个图片，解密的提示和思维应该就藏在图片里面
大致分析一下，图片提供的照片，可以知道是ASCII编码，进制是八进制，八进制一般而言是三个一组，数字以八进制为一组。这样思路就非常明确了，编写Python脚本直接求解：
c = "111 114 157 166 145 123 145 143 165 162 151 164 171 126 145 162 171 115 165 143 150"
c_list = c.split(" ")
m = ""
for i in c_list:
m += chr(int(i,8))
flag = "flag{"+m+"}"
print flag
运行脚本，得到flag：
flag{ILoveSecurityVeryMuch}
flag:flag{ILoveSecurityVeryMuch}
0xA 传感器
直接下载附件，查看附件：
5555555595555A65556AA696AA6666666955
这是某压力传感器无线数据包解调后但未解码的报文(hex)
已知其ID为0xFED31F，请继续将报文完整解码，提交hex。
提示1：曼联
提示是曼联，又是考察古典密码的题目，真是头疼。经过查询发现是曼彻斯特编码，在wiki百科上面找到曼彻斯特编码的相关信息：
在电信与数据存储中, 曼彻斯特编码（Manchester coding），又称自同步码、相位编码（phase encoding，PE），能够用信号的变化来保持发送设备和接收设备之间的同步。它用电压的变化来分辨0和1，从高电平到低电平的跳变代表1，而从低电平到高电平的跳变代表0(as per G.E.Tomas编码方式)。从高电平到低电平的跳变代表0，而从低电平到高电平的跳变代表1(as per IEEE 802.3编码方式)，下方有所展示。信号的保持不会超过一个比特位的时间间隔。即使是0或1的序列，信号也将在每个时间间隔的中间发生跳变。这种跳变将允许接收设备的时钟与发送设备的时钟保持一致。[1]
根据曼彻斯特编码的原理进行归纳，得到一个异或数据表
这个异或数据表应该就是曼彻斯特编码的具体原理，根据这个原理编写python脚本进行解密：
cipher='5555555595555A65556AA696AA6666666955'
def decrypto(cipher):
tmp=''
for i in range(len(cipher)):
a=bin(eval('0x'+cipher[i]))[2:].zfill(4)
tmp=tmp+a[1]+a[3]
# print(tmp)
plain = [ hex(int(tmp[i:i+8][::-1],2))[2:] for i in range(0,len(tmp),8)]
m = ''.join(plain).upper()
return m
if __name__ == "__main__":
flag = "flag{"+decrypto(cipher)+"}"
print flag
运行脚本，得到flag
flag{FFFFFED31F645055F9}
flag:flag{FFFFFED31F645055F9}
0xB 这是base？
应该是考察base的，直接下载附件查看附件：
dict:{0: 'J', 1: 'K', 2: 'L', 3: 'M', 4: 'N', 5: 'O', 6: 'x', 7: 'y', 8: 'U', 9: 'V', 10: 'z', 11: 'A', 12: 'B', 13: 'C', 14: 'D', 15: 'E', 16: 'F', 17: 'G', 18: 'H', 19: '7', 20: '8', 21: '9', 22: 'P', 23: 'Q', 24: 'I', 25: 'a', 26: 'b', 27: 'c', 28: 'd', 29: 'e', 30: 'f', 31: 'g', 32: 'h', 33: 'i', 34: 'j', 35: 'k', 36: 'l', 37: 'm', 38: 'W', 39: 'X', 40: 'Y', 41: 'Z', 42: '0', 43: '1', 44: '2', 45: '3', 46: '4', 47: '5', 48: '6', 49: 'R', 50: 'S', 51: 'T', 52: 'n', 53: 'o', 54: 'p', 55: 'q', 56: 'r', 57: 's', 58: 't', 59: 'u', 60: 'v', 61: 'w', 62: '+', 63: '/', 64: '='}
chipertext:
FlZNfnF6Qol6e9w17WwQQoGYBQCgIkGTa9w3IQKw
给出了base64的编码表，但不是标准的base64编码表，首先需要了解base标准的编码表：
标准的base64表
给出的字典数据和标准的base64表有很大的出出入，需要python脚本简单处理一下转换为标准的base64编码格式，然后再使用base64进行解密。python脚本：
import base64
file_dict = {0: 'J', 1: 'K', 2: 'L', 3: 'M', 4: 'N', 5: 'O', 6: 'x', 7: 'y', 8: 'U', 9: 'V', 10: 'z', 11: 'A', 12: 'B', 13: 'C', 14: 'D', 15: 'E', 16: 'F', 17: 'G', 18: 'H', 19: '7', 20: '8', 21: '9', 22: 'P', 23: 'Q', 24: 'I', 25: 'a', 26: 'b', 27: 'c', 28: 'd', 29: 'e', 30: 'f', 31: 'g', 32: 'h', 33: 'i', 34: 'j', 35: 'k', 36: 'l', 37: 'm', 38: 'W', 39: 'X', 40: 'Y', 41: 'Z', 42: '0', 43: '1', 44: '2', 45: '3', 46: '4', 47: '5', 48: '6', 49: 'R', 50: 'S', 51: 'T', 52: 'n', 53: 'o', 54: 'p', 55: 'q', 56: 'r', 57: 's', 58: 't', 59: 'u', 60: 'v', 61: 'w', 62: '+', 63: '/', 64: '='}
base64_dict ={}
index = 0
for i in (range(65,91) + range(97,123)+range(48,58)+range(43,44)+range(47,48)):
base64_dict[index] = chr(i)
index += 1
chipertext = "FlZNfnF6Qol6e9w17WwQQoGYBQCgIkGTa9w3IQKw"
m = ""
for i in range(len(chipertext)):
for j in range(64):
if(file_dict[j] == chipertext[i]):
m += base64_dict[j]
flag = base64.b64decode(m)
print flag
运行脚本，得到flag：
BJD{D0_Y0u_kNoW_Th1s_b4se_map}
flag:flag{D0_Y0u_kNoW_Th1s_b4se_map}
0xC rot
直接下载附件，查看附件：
破解下面的密文：
83 89 78 84 45 86 96 45 115 121 110 116 136 132 132 132 108 128 117 118 134 110 123 111 110 127 108 112 124 122 108 118 128 108 131 114 127 134 108 116 124 124 113 108 76 76 76 76 138 23 90 81 66 71 64 69 114 65 112 64 66 63 69 61 70 114 62 66 61 62 69 67 70 63 61 110 110 112 64 68 62 70 61 112 111 112
flag格式flag{}
看密文应该是ASCII码，结合题目应该是rot加密，应该是比较常规的rot13加密需要对数据进行-13操作，因为观察一下就可以非常清楚地发现有些ASCII数字超过123，可显示字符，因此可以推断是rot13加密。这里先用一个脚本处理一下：
c = "83 89 78 84 45 86 96 45 115 121 110 116 136 132 132 132 108 128 117 118 134 110 123 111 110 127 108 112 124 122 108 118 128 108 131 114 127 134 108 116 124 124 113 108 76 76 76 76 138 23 90 81 66 71 64 69 114 65 112 64 66 63 69 61 70 114 62 66 61 62 69 67 70 63 61 110 110 112 64 68 62 70 61 112 111 112"
c_list = c.split(" ")
c_str = ""
for i in c_list:
c_str += chr(int(i)-13)
print c_str
运行脚本，得到一个残缺的flag和MD5信息：
FLAG IS flag{www_shiyanbar_com_is_very_good_????}
MD5:38e4c352809e150186920aac37190cbc
MD5值应该是校验flag信息的，需要对MD5进行爆破来得到真实的flag，这里使用一个总的python脚本来求解：
import hashlib
c = "83 89 78 84 45 86 96 45 115 121 110 116 136 132 132 132 108 128 117 118 134 110 123 111 110 127 108 112 124 122 108 118 128 108 131 114 127 134 108 116 124 124 113 108 76 76 76 76 138 23 90 81 66 71 64 69 114 65 112 64 66 63 69 61 70 114 62 66 61 62 69 67 70 63 61 110 110 112 64 68 62 70 61 112 111 112"
c_list = c.split(" ")
c_str = ""
for i in c_list:
c_str += chr(int(i)-13)
# print c_str
# print c_str.find("{")
# print c_str.find("}")
# print c_str.find("3")
little_flag = c_str[8:49]
flag_md5 = c_str[54:]
flag_str = little_flag[:-5]
flag = ""
# print flag_str
for i in range(49,123):
for j in range(49,123):
for k in range(49,123):
for l in range(49,123):
result = flag_str + chr(i) + chr(j) + chr(k) + chr(l) + "}"
if hashlib.md5(result).hexdigest() == flag_md5:
flag = result
break
print flag
运行脚本，得到flag：
flag{www_shiyanbar_com_is_very_good_@8Mu}
flag:flag{www_shiyanbar_com_is_very_good_@8Mu}
0xD Keyboard
会是键盘密码吗？下载附件，瞧一瞧吧！
ooo yyy ii w uuu ee uuuu yyy uuuu y w uuu i i rr w i i rr rrr uuuu rrr uuuu t ii uuuu i w u rrr ee www ee yyy eee www w tt ee
果真是键盘密码，出现的字符都是26键键盘上面那一排对应的字符，而字符对应0-9的数字正好又对应着九键键盘的数字，而出现的次数代表九键键盘一个键的第几个字符，这样解密思路就非常流畅了。
根据图示内容编写一个python脚本：
str_26 = "pqwertyuio"
str_9 = "abc def ghi jkl mno pqrs tuv wxyz"
list_9 = str_9.split(" ")
dict_26 = {}
dict_9 = {}
index_26 = 0
index_9 = 0
for i in str_26:
dict_26[index_26] = i
index_26 += 1
for i in range(10):
if i < 2:
dict_9[i] = None;
else:
dict_9[i] = list_9[index_9]
index_9 += 1
# print dict_26
# print dict_9
c = "ooo yyy ii w uuu ee uuuu yyy uuuu y w uuu i i rr w i i rr rrr uuuu rrr uuuu t ii uuuu i w u rrr ee www ee yyy eee www w tt ee"
c_list = c.split(" ")
result = ""
for i in c_list:
for j in range(10):
if i[0] == dict_26[j]:
result += dict_9[j][len(i)-1]
flag = "flag{"+ result +"}"
print flag
运行脚本，得到flag：
flag{youaresosmartthatthisisjustapieceofcake}
flag:flag{youaresosmartthatthisisjustapieceofcake}
0xE 这是什么
查看题目描述：
小明是一个软件专业的高材生，但是老师布置的这次的作业似乎不怎么靠谱，因为他们老师以前是学物理的！喜欢乱七八糟命名文件，还喜欢奇奇怪怪的编码。你快帮小明看一下这题，小明准备好了一箱子辣条。 注意：得到的 flag 请包上 flag{} 提交
题目描述可以看到明显的提示：喜欢乱七八糟命名文件，还喜欢奇奇怪怪的编码。
这道题目应该考察的是奇奇怪怪的编码，下载附件，发现附件是一个apk文件，使用file命令简单查看一下apk文件的类型：
94f5b952-3710-4609-ab6f-bc11609fdc67.apk: Composite Document File V2 Document, Little Endian, Os: Windows, Version 6.1, Code page: 936, Author: Administrator, Template: Normal.dotm, Last Saved By: Administrator, Revision Number: 5, Name of Creating Application: Microsoft Office Word, Total Editing Time: 07:00, Create Time/Date: Tue Dec 30 03:15:00 2014, Last Saved Time/Date: Tue Dec 30 03:42:00 2014, Number of Pages: 3, Number of Words: 1921, Number of Characters: 10950, Security: 0
发现文件应该是一个document文件，可以修改成txt文件查看文件内容
邢唷?? > ? H J ? G 欹? € 餜? U: bjbj肴肴 8@ 墷 墷 G2
? P P ? ? ? ? ? ? ? ? 8 ? ? ? N l ? ? ? ? ? 1 1 1 ? ? ? ? ? ? ? $ ? ? ^ ? ? 1 1 1 1 1 ? ? ? ? ? 4 ? ? ? 1 X ? ? ? ? ? ? 1 ? ? ? ? ? 癴櫄?? ? ? ? ? 0 N ? ? ? ? ? ? ? ? 0 1 1 ? 1 1 1 1 1 ? ? ? 1 1 1 N 1 1 1 1 ? 1 1 1 1 1 1 1 1 1 P _ : 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应该可以非常容易地看出这种编码格式是JSFuck编码，可以去JSFuck官方网站进行解密：
成功拿到flag，flag：flag{a0448fd730b62c13ca80200c4529daa2}
0xF childRSA
RSA题目，有趣，直接下载附件，查看附件内容：
from random import choice
from Crypto.Util.number import isPrime, sieve_base as primes
from flag import flag
def getPrime(bits):
while True:
n = 2
while n.bit_length() < bits:
n *= choice(primes)
if isPrime(n + 1):
return n + 1
e = 0x10001
m = int.from_bytes(flag.encode(), 'big')
p, q = [getPrime(2048) for _ in range(2)]
n = p * q
c = pow(m, e, n)
# n = 32849718197337581823002243717057659218502519004386996660885100592872201948834155543125924395614928962750579667346279456710633774501407292473006312537723894221717638059058796679686953564471994009285384798450493756900459225040360430847240975678450171551048783818642467506711424027848778367427338647282428667393241157151675410661015044633282064056800913282016363415202171926089293431012379261585078566301060173689328363696699811123592090204578098276704877408688525618732848817623879899628629300385790344366046641825507767709276622692835393219811283244303899850483748651722336996164724553364097066493953127153066970594638491950199605713033004684970381605908909693802373826516622872100822213645899846325022476318425889580091613323747640467299866189070780620292627043349618839126919699862580579994887507733838561768581933029077488033326056066378869170169389819542928899483936705521710423905128732013121538495096959944889076705471928490092476616709838980562233255542325528398956185421193665359897664110835645928646616337700617883946369110702443135980068553511927115723157704586595844927607636003501038871748639417378062348085980873502535098755568810971926925447913858894180171498580131088992227637341857123607600275137768132347158657063692388249513
# c = 26308018356739853895382240109968894175166731283702927002165268998773708335216338997058314157717147131083296551313334042509806229853341488461087009955203854253313827608275460592785607739091992591431080342664081962030557042784864074533380701014585315663218783130162376176094773010478159362434331787279303302718098735574605469803801873109982473258207444342330633191849040553550708886593340770753064322410889048135425025715982196600650740987076486540674090923181664281515197679745907830107684777248532278645343716263686014941081417914622724906314960249945105011301731247324601620886782967217339340393853616450077105125391982689986178342417223392217085276465471102737594719932347242482670320801063191869471318313514407997326350065187904154229557706351355052446027159972546737213451422978211055778164578782156428466626894026103053360431281644645515155471301826844754338802352846095293421718249819728205538534652212984831283642472071669494851823123552827380737798609829706225744376667082534026874483482483127491533474306552210039386256062116345785870668331513725792053302188276682550672663353937781055621860101624242216671635824311412793495965628876036344731733142759495348248970313655381407241457118743532311394697763283681852908564387282605279108
发现附件文件是一个python程序，可以看到rsa加密算法的具体细节，可以看到一个关键函数：
def getPrime(bits):
while True:
n = 2
while n.bit_length() < bits:
n *= choice(primes)
if isPrime(n + 1):
return n + 1
对函数进行审计发现大素数生成的细节并不是很清晰，需要对Crypto.Util.number库的sieve_base模块进行检索，来获取更多的信息。经过查询发现，sieve_base模块是一个前10000个素数的素数表，可以节约素数生成的时间。使用数学工具查询第10000个素数是104729，但是知道这个好像也没什么用的样子。仅仅知道p和q是生成算法是由小于104729的数随机生成的。这里需要引入一个smooth number的概念：[3]
光滑数（smooth number），或译脆数，是一个可以约数分解为小素数乘积的正整数。光滑数一词是是伦纳德·阿德曼所提出。光滑数在以约数分解为基础的密码学中扮演重要角色。[2]
现在有了两个材料，没有工具，要想解决这道题目，还需要有个工具来处理，费马小定理。这道题目主要是在考察大数分解的方法——Pollard’s p-1 method，这个大数分解方法非常巧妙，其数学证明也非常优美。回到题目来，现在我们有这些信息，该如何处理这道题目呢？这里先利用已有的信息进行简单的数学演绎：
首先来康康费马小定理：
$$ a^{p-1} \equiv 1 \quad (\text{mod} p) $$
也就是说，指数那边每增加( p-1 ) ，其结果仍然不变。指数以( p-1 ) 为一个循环。
我们将其变形一下：
$$ a^{p-1} – 1 \equiv 0 \quad (\text{mod} p) $$
模p同余0，也就是说( a^{p-1} – 1 ) 是 ( p ) 的倍数。将同余式改写为等式：
$$ a^{t \times (p-1)} – 1 = k\times p $$
其中 $t, k$ 是两个整数。
如果指数( exp )是 ( p-1 ) 的倍数，那么( a^{exp} – 1 )就会是 ( p ) 的倍数。
上面的( p )均指某一个质数，而非( N=pq )中的( p )
这里很关键。
如果我们能够找到一个指数( L )，使得对于某一个底数( a )，( a^{L} – 1 ) 是( p )的倍数，但不是( q )的倍数。
这时，我们只要去计算 $$ gcd(a^{L}-1, N) $$ 得到的结果，必定是( p )。也就是说，我们成功地分解了( N )。
那么该怎么去寻找这个( L )呢，这个时候就需要用到光滑数的概念了，需要使用一下光滑数这个不错的材料来进行求解：
对于每一个$n = 2, 3, 4, …$，我们任意选择一个底数$a$（事实上，我们可以简单地选择为2），并计算 $$ gcd(a^{n!-1}, N) $$
如果结果落在1和( N ）中间，便可成功进行求解。
现在根据上述算法原理编写python脚本进行求解：
from Crypto.Util.number import sieve_base as primes
import gmpy2
n = 32849718197337581823002243717057659218502519004386996660885100592872201948834155543125924395614928962750579667346279456710633774501407292473006312537723894221717638059058796679686953564471994009285384798450493756900459225040360430847240975678450171551048783818642467506711424027848778367427338647282428667393241157151675410661015044633282064056800913282016363415202171926089293431012379261585078566301060173689328363696699811123592090204578098276704877408688525618732848817623879899628629300385790344366046641825507767709276622692835393219811283244303899850483748651722336996164724553364097066493953127153066970594638491950199605713033004684970381605908909693802373826516622872100822213645899846325022476318425889580091613323747640467299866189070780620292627043349618839126919699862580579994887507733838561768581933029077488033326056066378869170169389819542928899483936705521710423905128732013121538495096959944889076705471928490092476616709838980562233255542325528398956185421193665359897664110835645928646616337700617883946369110702443135980068553511927115723157704586595844927607636003501038871748639417378062348085980873502535098755568810971926925447913858894180171498580131088992227637341857123607600275137768132347158657063692388249513
c = 26308018356739853895382240109968894175166731283702927002165268998773708335216338997058314157717147131083296551313334042509806229853341488461087009955203854253313827608275460592785607739091992591431080342664081962030557042784864074533380701014585315663218783130162376176094773010478159362434331787279303302718098735574605469803801873109982473258207444342330633191849040553550708886593340770753064322410889048135425025715982196600650740987076486540674090923181664281515197679745907830107684777248532278645343716263686014941081417914622724906314960249945105011301731247324601620886782967217339340393853616450077105125391982689986178342417223392217085276465471102737594719932347242482670320801063191869471318313514407997326350065187904154229557706351355052446027159972546737213451422978211055778164578782156428466626894026103053360431281644645515155471301826844754338802352846095293421718249819728205538534652212984831283642472071669494851823123552827380737798609829706225744376667082534026874483482483127491533474306552210039386256062116345785870668331513725792053302188276682550672663353937781055621860101624242216671635824311412793495965628876036344731733142759495348248970313655381407241457118743532311394697763283681852908564387282605279108
t=pow(2,2048)
e = 0x10001
k=2
for i in range(10000):
k=pow(k,primes[i],n)
if(k>t):
if(i%15==0):
if(gmpy2.gcd(k-1,n)!=1):
print(gmpy2.gcd(k-1,n))
break
p=gmpy2.gcd(k-1,n)
q=n//p
phi=(p-1)*(q-1)
d=gmpy2.invert(e,phi)
m=pow(c,d,n)
flag=hex(m)[2:].decode('hex')
print(flag)
运行脚本，可能需要等一段时间，大致7s就能跑出来flag：
NCTF{Th3r3_ar3_1ns3cure_RSA_m0duli_7hat_at_f1rst_gl4nce_appe4r_t0_be_s3cur3}
flag:flag{Th3r3_ar3_1ns3cure_RSA_m0duli_7hat_at_f1rst_gl4nce_appe4r_t0_be_s3cur3}
参考
本期wp分享到此为止，有时间再来喝杯茶呀！
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