Crypto | Nookcrypt | UIUCTF 2020

This is a sourceless Elliptic Curve Crypto (ECC) challenge. ECC is scaryyyy, but I might as well give it a try. Problem Tom Nook is testing a new encryption scheme for nookphones, but it seems to be a bit faulty... can you break it? Hints given during ctf: Cosmic rays corrupted the prime with random chance in the first option. There are no faults in the second option. Solution We were given some service running at nc chal.

Crypto | Et Tu Blathers | UIUCTF 2020

This is my first ctf writeup. How exciting! This problem is a warmup crypto question on Vigenere cipher. Problem Et tu Mr. Mayor?! Mr mayor is eating his salad and he has a good ‘Vigenerete’ dressing. He is also trying to read his email, but something is wrong with the first line of this file… I think it is encoded! Can you decrypt it? Wrap your result in uiuctf{} You may find a wordlist of commonly used words helpful for this challenge