cryptography

Ciphers

• dcode.fr - A web app for encryption, encoding, compression, and data analysis.
• quipqiup - A web app for solving simple substitution ciphers.
• Rumkin - A web app for encryption, encoding, compression, and data analysis.

Steganography

• Aperi'Solve - A web app for solving stego challenges.
• StegOnline - A checklist for solving stego challenges.
• binwalk - A tool for analyzing, reverse engineering, and extracting firmware images.

DTMF

• dtmf-detect - A web app for detecting DTMF tones.
• dtmf-decoder - A Python script to decode DTMF tones.

DTMF -> Multi-Tap Cipher? DTMF -> ASCII DTMF -> Hex -> ASCII

RSA

• RsaCtfTool - Installation script for RsaCtfTool