In this post I will introduce custom shellcode crypter based on HC-128 cipher. Introduction to HC-128 cipher The HC-128 algorithm is a software-efficient, synchronous symmetric stream cipher designed by Hongjun Wu. The cipher makes use of a 128-bit key and 128-bit initialization vector. I will use HC-128 library developed in ECRYPT II project and simple stack execve shellcode. /bin/sh execve …