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steganography

Definitions:

  The art, science, and practice of communicating in a way that hides the existence of the communication.
Sources:
CNSSI 4009-2015 from NIST SP 800-72 - Adapted

  The art and science of communicating in a way that hides the existence of the communication. For example, a child pornography image can be hidden inside another graphic image file, audio file, or other file format.
Sources:
NIST SP 800-101 Rev. 1 under Steganography
NIST SP 800-72 under Steganography

  Embedding data within other data to conceal it.
Sources:
NIST SP 800-86 under Steganography