FEAL - CSAW CTF 2014 Quals Crypto300This document provides information about breaking the FEAL 4.3 block cipher that was used in the CRYPT0 300 challenge of the CSAW CTF 2014 quals. It describes using differential cryptanalysis to find the encryption subkeys (K0-K5) by analyzing the differences in plaintext and ciphertext pairs. It includes code examples of analyzing differential values at each round to iteratively determine each su
