11-20.7z

Many "nested zip" challenges use a pattern where the filename itself is the key.

: The content might be XORed with a static key (e.g., FlareOn2024 ). 11-20.7z

While there isn't a single famous global CTF challenge exclusively named , this file naming convention is a hallmark of forensics and steganography challenges where players must navigate deeply nested archives or "Russian Doll" files. Many "nested zip" challenges use a pattern where