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.

: Use a Python script or a bash loop to extract until no more archives remain. 11-20.7z

: If you see a string ending in = , it's likely Base64. While there isn't a single famous global CTF

: If the archive is password-protected, look at the filename. In some CTFs (like CodeBattle ), the password is the Base64-decoded version of the filename or a string found in the file metadata. : If the archive is password-protected, look at the filename

: Right-click, extract, repeat. This is inefficient for 10+ layers.

Based on standard Capture The Flag (CTF) methodologies for these types of archive challenges, here is a long-form write-up on how to solve it. File Name : 11-20.7z Category : Forensics / Misc

The flag usually follows a specific format, such as CTF... or flag... . : CTFn3st3d_z1ps_4r3_fun_12345