BronoCTF : Custom Cipher Writeup

BronoCTF featured two distinct challenges. The Custom Cipher utilized pscheme.py, encoding flag chunks as roots in a public polynomial. Recovery involved polynomial division by the public key, factoring the quartic, and reversing a shuffle using an 8-bit order field. Meanwhile, the LEts a GO forensics challenge provided a 63 KB zip archive containing 333 files. Participants navigated a deep directory tree filled with decoy entries to locate the flag: bronco{3ve4yth1ng_1s_aw3s0me} within the provided data.