SECCON CTF 2014: Decrypt it (Hard)

Category: Crypto Points: 300 Description:

g^k=69219086192344
20<k<20000

c2.zip

Write-up

(TODO)

$ unzip c2.zip
Archive:  c2.zip
   creating: crypt2/
  inflating: crypt2/E
  inflating: crypt2/eflag.bin
  inflating: crypt2/readme.txt

$ cat crypt2/readme.txt
./E 1 69219086192344 flag.png eflag.bin

$ file crypt2/E
crypt2/E: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24, stripped

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