Writeups
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.
CTF Writeups
| CTF | Category |
|---|---|
| M0lecon 2022 | Isogenies |
| DiceCTF 2022 | VDF, Commitment Schemes [🥇 Best Writeup Award] |
| 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 |
| Chujowy | Elliptic Curves |
| ASIS Quals 2020 | Elliptic Curves, RSA, Blum-Goldwasser, Diophantine Eqns. |
| 0CTF 2020 | DSA, Hyperelliptic Curves |
| redpwn 2020 | RSA, ECDSA, Elliptic Curves |
| HackTM | Crypto, OSint |
| INS’HACK | RSA |
| SecurityFest | Modular Arithmetic |
| HSCTF 2019 | Crypto |
| picoCTF 2019 | General, Binary, Crypto, Forensics, Web |
Misc
Some other CTF-like problems I’ve looked into, with some code and thoughts (this is very much a work in progress).