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The original was posted on /r/todayilearned by /u/splityoassintwo on 2023-08-30 14:48:11+00:00.

Original Title: TIL of Steganography, a field similar to cryptography, but that involves concealing a message rather than encoding it. For example, hiding an image in audio, or even hiding one image in the data of another. A famous example, a POW in Vietnam blinked TORTURE in morse code during a newscast.