Here is a collection of write ups and discussions of the challenges I have solved in various capture the flag competitions. The focus is usually the cryptographic challenges.
|Crypto CTF 2021||Elliptic & Edwards Curves, RSA, Diophantine Eqns.|
|Cyber Apocalypse CTF 2021||RSA, Elliptic & Hyperelliptic Curves, Multivariate, Maths|
|Zer0pts 2021||Elliptic Curves, Polynoimial Rings|
|TetCTF 2021||Gaussian Integers, Discrete Log Problem, Finite Fields|
|CryptoCTF 2020||Moebius Inversion, Unsolved (Unsolvable?)|
|CryptoCTF 2020||Team Writeup, all challenges|
|ASIS Quals 2020||Elliptic Curves, RSA, Blum-Goldwasser, Diophantine Eqns.|
|0CTF 2020||DSA, Hyperelliptic Curves|
|redpwn 2020||RSA, ECDSA, Elliptic Curves|
|picoCTF 2019||General, Binary, Crypto, Forensics, Web|
Some other CTF-like problems I’ve looked into, with some code and thoughts (this is very much a work in progress).