Last active
August 10, 2018 00:50
-
-
Save AkashiSN/8205ce4645f0f8428809678bb7ab4955 to your computer and use it in GitHub Desktop.
Low Public-Exponent Attack - https://blog.akashisn.info/entry/2018/08/07/150018
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/usr/bin/env python3 | |
# | |
# Low Public-Exponent Attack | |
# | |
import gmpy2 | |
n = int(input('n:')) | |
e = int(input('e:')) | |
c = int(input('c:')) | |
m,result = gmpy2.iroot(c,e) | |
print("[+] gmpy2.iroot(c,e) : {}".format(result)) | |
print("[+] m^e(mod n) == c? : {}".format(pow(m,e,n) == c)) | |
try: | |
flag = binascii.unhexlify(format(m, 'x')).decode() | |
except Exception as e: | |
flag = m | |
print("FLAG: {}".format(flag)) |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
; | |
; Low Public-Exponent Attack sample - CpawCTF - Common World | |
; | |
n:236934049743116267137999082243372631809789567482083918717832642810097363305512293474568071369055296264199854438630820352634325357252399203160052660683745421710174826323192475870497319105418435646820494864987787286941817224659073497212768480618387152477878449603008187097148599534206055318807657902493850180695091646575878916531742076951110529004783428260456713315007812112632429296257313525506207087475539303737022587194108436132757979273391594299137176227924904126161234005321583720836733205639052615538054399452669637400105028428545751844036229657412844469034970807562336527158965779903175305550570647732255961850364080642984562893392375273054434538280546913977098212083374336482279710348958536764229803743404325258229707314844255917497531735251105389366176228741806064378293682890877558325834873371615135474627913981994123692172918524625407966731238257519603614744577 | |
e:11 | |
c:80265690974140286785447882525076768851800986505783169077080797677035805215248640465159446426193422263912423067392651719120282968933314718780685629466284745121303594495759721471318134122366715904 | |
[+] gmpy2.iroot(c,e) : True | |
[+] m^e(mod n) == c? : True | |
FLAG: 424311244315114354 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
; | |
; Low Public-Exponent Attack sample - CpawCTF - Common World - hint.txt | |
; | |
n:236934049743116267137999082243372631809789567482083918717832642810097363305512293474568071369055296264199854438630820352634325357252399203160052660683745421710174826323192475870497319105418435646820494864987787286941817224659073497212768480618387152477878449603008187097148599534206055318807657902493850180695091646575878916531742076951110529004783428260456713315007812112632429296257313525506207087475539303737022587194108436132757979273391594299137176227924904126161234005321583720836733205639052615538054399452669637400105028428545751844036229657412844469034970807562336527158965779903175305550570647732255961850364080642984562893392375273054434538280546913977098212083374336482279710348958536764229803743404325258229707314844255917497531735251105389366176228741806064378293682890877558325834873371615135474627913981994123692172918524625407966731238257519603614744577 | |
e:13 | |
c:14451037575679461333658489727928902053807202350950440400755535465672646289383249206721118279217195146247129636809289035793102103248547070620691905918862697416910065303500798664102685376006097589955370023822867897020714767877873664 | |
[+] gmpy2.iroot(c,e) : True | |
[+] m^e(mod n) == c? : True | |
FLAG: 424311244315114354 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment