SECCON CTF 2014: Decrypt it (Easy)

Category: Crypto Points: 200 Description:

crypt1.zip

Write-up

(TODO)

$ unzip crypt1.zip
Archive:  crypt1.zip
  inflating: ecrypt1.bin
  inflating: rnd
  inflating: readme.txt

$ cat readme.txt
./rnd crypt1.png ecrypt1.bin

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

Other write-ups and resources

• http://tasteless.eu/2014/12/seccon-quals-2014-decrypt-it-easy-crypto200/
• http://blogs.univ-poitiers.fr/e-laize/2014/12/08/seccon-2014-quals-crypto-decrypt-it/