I played NuttyShell CTF 2025 organized by the Hong Kong Polytechnic University, and came across siunam’s web challenges. In particular, memo-ry is a hard challenge that required players to chain multiple vulnerabilities to retrieve the flag. I found it really fun and decided to compile a writeup for this.

Time flies. A week passed in the blink of an eye, and another month has passed with another blink… and here comes the end of 2024.

This time I went to @DeFiHackLabs and attempt my very first Web3-focused CTF. I am fortunately able to solve some challenges. Nothing particular difficult, but that’s still something.

The crypto challenge authors in HITCON 2024, @maple3142 and @_bronson113 prepared a set of exciting and difficult challenges.

I collaborated with @thehackerscrew1 as a guest player this time. In this blog post, we will cover three challenges: ZKPoF, PCBC Revenge and Hyper512.

IDEA is a challenge written by @0xdeuterium. He even provided me the paper to refer, my only contribution to the challenge is to optimize the original solution so that we don’t need 65K-ish oracle calls.