GNU Collaborative International Dictionary of English

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  1.       
Steganography (stĕgˌȧ‑nŏgˈrȧ‑fy̆), n. [Gr. στεγανός covered (fr. στέγειν to cover closely) + -graphy.]
    1. The art of writing in cipher, or in characters which are not intelligible except to persons who have the key; cryptography.

    [1913 Webster]


    2. Specifically: The branch of cryptography in which messages are hidden inside other messages; -- used commonly for the process of hiding messages inside a computerized image file, as for example hiding the name and copyright notice of the owner of an image as protection against violation of the copyright.

    [PJC]

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