FY² - Custom Encryption Algorithm Challenge

The post presents a custom encryption algorithm called FY², providing a Dropbox link to a challenge file containing an encrypted Python script (encryptor.py.enc) and its key (encryptor.py.key). The original file was encrypted without standard libraries, and the flag follows the format FY2{...}. The SHA-256 hash of the challenge file is d7fef47644693716460d232da0de6e17eaf6df9b998f9d8bbbc022edb0f32b00. Participants are instructed to DM the flag privately to the poster and avoid public discussions or spoilers.