SimpleSalami1965 t1_ja9nhzl wrote
Reply to comment by RealJonathanBronco in TIL: The concept of steganography which is the hiding of messages in plain sight. For example, Phyllis Latour Doyle (British spy) parachuted into France to spy on Nazis before D-day. She used knitting to record messages. by Geek_Nan
Hack This Site has some fun steganography puzzles, too. Not nearly as in-depth as all that, though.
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