Writeup for Crypto Problems in 5spaceCTF 2020

Writeup for 3 crypto challenges in “第五空间” 智能安全大赛 2020 (2020-06-24 09:00 +12h).
- (easy) rosb: RSA common modulus attack
- (medium) UnSafeAES: AES-GCM nonce reuse && forbidden attack
- (interesting) tinysocks: redirect attack on Shadowsocks stream ciphers.