Steganography

• Steganos (Hidden) Graphic (Writing)

  • Steganography = Hidden Writing
  • Concealment s.t. Content is not apparent

• >3,000 years old

  • Write on slaves shaved head, grow hair back
  • Recipient knows to shave slave for content

• WWII

  • Microdots, German positional ciphers, etc.

• Modern

  • Hidden in waveforms, packets, files, protocols...

Notes: