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updates_ #8

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Create rsa_1.py
RDxR10 Jun 8, 2021
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Create rsa_2.py
RDxR10 Jun 8, 2021
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Create b1n4rY.md
RDxR10 Jun 8, 2021
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8 changes: 8 additions & 0 deletions Codefest CTF/b1n4rY.md
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We are given a binary list of pixels:

```
111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111100000000000000110000110000111111001100000000000000111111111111111111111111111111000000000000001100001100001111110011000000000000001111111111111111111111111111110011111111110011111100000011111111110011111111110011111111111111111111111111111100111111111100111111000000111111111100111111111100111111111111111111111111111111001100000011001111000011111100001111001100000011001111111111111111111111111111110011000000110011110000111111000011110011000000110011111111111111111111111111111100110000001100110000110011000000111100110000001100111111111111111111111111111111001100000011001100001100110000001111001100000011001111111111111111111111111111110011000000110011001100111111000011110011000000110011111111111111111111111111111100110000001100110011001111110000111100110000001100111111111111111111111111111111001111111111001100110000001100110011001111111111001111111111111111111111111111110011111111110011001100000011001100110011111111110011111111111111111111111111111100000000000000110011001100110011001100000000000000111111111111111111111111111111000000000000001100110011001100110011000000000000001111111111111111111111111111111111111111111111000011000011001111111111111111111111111111111111111111111111111111111111111111110000110000110011111111111111111111111111111111111111111111111111001111110011000000111100110011000000000000001111001111111111111111111111111111110011111100110000001111001100110000000000000011110011111111111111111111111111111100111111001111110000111111111111000011000000111111111111111111111111111111111111001111110011111100001111111111110000110000001111111111111111111111111111111111110011001111000011110000001111110011001100000000111111111111111111111111111111111100110011110000111100000011111100110011000000001111111111111111111111111111111111110000001111110000110011111100110011111100110011001111111111111111111111111111111100000011111100001100111111001100111111001100110011111111111111111111111111111111111111000000000011111100111111000000111111000011111111111111111111111111111111111111110000000000111111001111110000001111110000111111111111111111111111111111110011110000111100001111110000110000001111000011111111111111111111111111111111111100111100001111000011111100001100000011110000111111111111111111111111111111111111111111001111000011111100001100000011111111110011111111111111111111111111111111111111110011110000111111000011000000111111111100111111111111111111111111111111111111110011110011000000000000110000110011001111001100111111111111111111111111111111111100111100110000000000001100001100110011110011001111111111111111111111111111110000000011000000001100001100111100000000001100110011111111111111111111111111111100000000110000000011000011001111000000000011001100111111111111111111111111111111111111111111111100001100111111000011111100001111111111111111111111111111111111111111111111111111000011001111110000111111000011111111111111111111111111111111111100000000000000110011110000000011001100110000111111111111111111111111111111111111000000000000001100111100000000110011001100001111111111111111111111111111111111110011111111110011111111111111000000111111001100000011111111111111111111111111111100111111111100111111111111110000001111110011000000111111111111111111111111111111001100000011001100000011111100110000000000110011111111111111111111111111111111110011000000110011000000111111001100000000001100111111111111111111111111111111111100110000001100111100000000001100000000111100110000111111111111111111111111111111001100000011001111000000000011000000001111001100001111111111111111111111111111110011000000110011110011001111001100111100111100001111111111111111111111111111111100110000001100111100110011110011001111001111000011111111111111111111111111111111001111111111001111001111111111111111000000110000111111111111111111111111111111110011111111110011110011111111111111110000001100001111111111111111111111111111111100000000000000110011111111111100110011000000000000111111111111111111111111111111000000000000001100111111111111001100110000000000001111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
```

* Using https://www.dcode.fr/binary-image we convert this to an image which is a QR.
* Decoding it gives us the flag.
11 changes: 11 additions & 0 deletions Codefest CTF/rsa_1.py
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from Crypto.Util.number import *
n = 750663646847528873168937831391907810647591913965562495296199585082759057318274521553757550724463451891668175905206221877858317290777877060166997790624527965837837993129383290402509996587556406778482067347232022225466937668396768390983554357611376057823852179263682649072729435912583278183812954787442057976301035654942470184201720410477691326653029842426252391647509934740335989269071438620690320401576861478427178128804784352142271832603194431176323445880836139
pq = 80970512687406090889060992576336286518763523653333428346066206717567693624044162491796922556346210471950404967161997779545603412053582932354160368128117099634532601019309976159157713252768640669410333127578132624183514430252557952811102781031315190048386214745340936679285725364013916829276058253922234988379
c = 221975957171552618997196127189899209276336291387640550554967727731818563960555600691881715668156105819191779108737770660990397331961689607338541452069797368288215716485835439777459317512238532636172979397173548812054679237802827275184091619620252887678664409116710340000218841023351238456144820005968602870644031701303645229364391309952172259686888808938835775360009896210855708140351244441167461823250549764537506364091367096196182191704433664638829177854628679

e = 65537
r = n//(pq)
d = inverse(e,r-1)
m = pow(c,d,r)

print(long_to_bytes(m))
12 changes: 12 additions & 0 deletions Codefest CTF/rsa_2.py
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from Crypto.Util.number import *
from labmath import polyrootsmod

p = 151504136086085116766143566124150275674073392929821608731193313303579549567486780984882103878189021716475112187664571076380701312144707968796469474077396203079356104319166539457117762979236714826426908047910529451429037552027255450267166159899155876867790669696867818896423172168830285791913854195932438702321
q = 103830664295009091893886752305087173101905116416231118984740125697489572383920741106883033358012404414250903398273361420080940861355058896027909558044477593238426139173175903469841531670082355641543985372882381822644581374082868518234109972478903771291945965032201075848195104712153515556622192413687460682033
e = 112
c = 7376083179301871727319662441290512768979499624954698397165424050024666168943377478129926304132046879741349597229411809080978573590530226067752606719487158834511752336008287600324551704896881690547279678544392014784520001523240813365339789395536491039305623640655624806350548548554437985830405020169663539939018239643445566882380359742208558132490655657280619850656880232036155057833081215187526442724687828214045430674207843841122060416377750502505640447395732809699800028565067081780511133517020113861405502897034245617267331520262877918693182867532420288135211820606290453667200638642871988519470430475958049806666
for i in polyrootsmod([-c, *[0 for i in range(e - 1)], 1],
{p: 1, q: 1}):
while (long_to_bytes(i).endswith(b'}')):
print(long_to_bytes(i))
break