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The Wartime Spies Who Used Knitting as an Espionage Tool - Atlas Obscura
Grandma was just making a sweater. Or was she?
cryptography
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510
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steganography
March 1, 2019 at 12:39:20 AM UTC ·
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https://www.atlasobscura.com/articles/knitting-spies-wwi-wwii
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