Bach_guitar.rar -

Attempt to extract the archive. Many versions of this challenge are password-protected.

Typically looks like CTF{...} or FLAG{...} . Bach_Guitar.rar

Use strings to look for readable text at the end of the file. Inspect the LSB (Least Significant Bit) using zsteg . Open the file in Audacity . Attempt to extract the archive

Looking for a in the archive (using 7z l -slt Bach_Guitar.rar ). Bach_Guitar.rar

A text file named flag.txt extracted from the image.

Common methods to find the password include:

Check for DTMF tones (phone keypad sounds) that might represent a code. The flag is usually hidden in one of three ways: