isaacarsenal t1_ja868u3 wrote
Reply to comment by iTwango 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
Radio by Rammstein (a famous German band) is about this.
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