Steganography

Updated 31 Jul 2026

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def
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  Greek for "concealed writing" — hiding a message so it's invisible, though it's really there (the container document/file is called the "covertext"); a form of security through obscurity
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common techniques
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  network-based — embedding messages in TCP packets
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  image-based — embedding a message directly in an image
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  invisible watermarks — e.g., yellow tracking dots printed by some printers
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other types
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  audio steganography — interlacing a secret message within a digital audio file
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  video steganography — applying image steganography across a sequence of frames, which can transfer much more information
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related
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  Obfuscation
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cards
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  What is steganography, literally?
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    Greek for 'concealed writing' — hiding a message inside another file (image, audio, video) so it's invisible but still present

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