Steganography

Steganography is the practice of concealing a message within another message or a physical object. In computing/electronic contexts, a computer file, message, image, or video is concealed within another file, message, image, or video.

• HackTricks
• Steganography Software List

Tools

• Audacity
• Binwalk
• Steghide

Online Tools

• Forensically – Image files
• dCode.fr

Checklist for Word Documents (CTF)

• Select all text and change font color to black. Text is sometimes white on white.
• Select all text and change font size. Sometimes flag is hidden in small characters.
• strings -e l file.doc | grep -i FLAG
• Look in macros

Checklist for Audio (CTF)

See Audacity.

• Reverse sound (Effect ->Reverse)
• Spectrogram View (click on file name on the left -> Spectrogram) then zoom in or out
• Increase or decrease speed
• Change Frequency (Hz)