On 13 February, 2021, kurenaif (@fwarashi) has released five challenges celebrating the 1000-subscription in the YouTube channel1. Being locked at home in Lunar New Year, I have nothing else to do. Therefore I decided to attempt those challenges, which is available on GitHub. Note. The writeup is actually compiled on the same day. It is published on 21 Feburary to not spoil the challenges. p_p_rsa Challenge Summary In the challenge, we are given a RSA public key and an ciphertext $c$ (of mess...
