Tags: crypto linear_algebra
Rating: 5.0
TLDR;
- Consecutive digraphs cipher with known plaintext
- Set up system of equations to limit possible keys
- Bruteforce a small amount of possible keys
- Recover all 12 equivalent keys to get the flag
[writeup](https://jsur.in/posts/2020-04-27-ijctf-2020-writeups#nibiru)
