Rating:
Three of our best agents: Ron, Adi, and Leonard, were investigating the notorious hacker group known as the unF0r7un@t3s. Fortunately, one of their members dropped a fortune cookie behind from their last scandal. We believe it might be a clue to where they will attack next. The fortune inside read: You will find your fortune at 23441987, 31018357. The lucky numbers on the back were, n52035749, e101, and *10^-6. What location do you think they will be heading to next?
NOTE: No wrapper is necessary for this problem.
- YoshiBoi#2008
Ok... several hints in the task description ^^. First of all, the names of the best agents Ron, Adi and Leonard, coincidentally are the firstnames of the authors of the RSA crypto system. Also the names of the parameters: n and e also exist in RSA.
So... considering this, we concluded that the first step of getting the flag was cracking the encrypted RSA.
You can simply use RSACtfTool for this:
python27 RsaCtfTool.py -e101 -n52035749 --uncipher 23441987
Unciphered data :
HEX : 0x02e98cd7
INT (big endian) : 48860375
INT (little endian) : 3616336130
STR : b'\x02\xe9\x8c\xd7'
python27 RsaCtfTool.py -e101 -n52035749 --uncipher 31018357
Unciphered data :
HEX : 0x23aefe
INT (big endian) : 2338558
INT (little endian) : 16690723
STR : b'#\xae\xfe'
HEX : 0x0023aefe
INT (big endian) : 2338558
INT (little endian) : 4272825088
STR : b'\x00#\xae\xfe'
... all that was left to do now, was to take the INT (big endian) results, divide them by the last lucky number, and enter the resulting GPS coordinates on Google Maps:
... the flag therefore was: Louvre
