yence

Challenge

• CTF: Hack The Boo 2023 - Practice Official Writeup
• Name: yence
• Category: Crypto
• Difficulty: Very Easy
• Points: 400
• Description: During the pranking labs, the ghosts create a spooky encryption algorithm, and at midnight, they go outside to scare people by encrypting every device they own. To assess the situation at the end of the night, the professors have developed a spooky meter to measure how much people were spooked by the ransomware. The goal is to create irreversible ransomware that inflicts maximum damage. However, having interacted with humans over the past months, you’ve grown fond of them and don’t want to harm them. You even managed to befriend a human who fell victim to such an attack. Can you help your friend unlock his files?
• Objective: AES CTR Nonce Reuse

Files

Download: crypto_yesnce.zip

Writeup

TBD