• Adding two images
• xor_bytes
• color crypto

• Pull out the audio with ffmpeg:

$ ffmpeg -i windows.mp4 windows.wav

• Make a gif from video using ffmpeg

$ ffmpeg -i windows.mp4 windows.gif

• Online tool for images:
  • utilitymill
  • pngcheck
  • Paranoid.jar

Image metadata

• To find information inside a picture, we can use package pnginfo or pngcheck.

• If we need base64 decoding (for example a PGP key with a picture).

• Weird pieces of bytes may need to be XORed.

• If we have a decrypted message and a key:

  1. Import the private key to use it to decrypt the message with gpg --allow-secret-key-import --import private.key
  2. Decrypt with gpg --decrypt message.pgp.

• ExifTool

• OpenStego
• OutGuess
• Gimp
• Audacity
• MP3Stego
• ffmpeg
• pngcheck
• StegFS
• Steghide