brkh47 t1_ja97uzs wrote
Reply to comment by nicky7 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
There was also this link if you clicked on steganography in the article that digital cat is pretty cool.
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