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bonreu t1_ja7enp6 wrote

Reply to comment by laserdicks 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

You send a message. They can't tell what's in the message, but they can tell you send a message to someone. And they can ask you who you sent it to, and what was in it. Very thoroughly ask.

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