TIL that Leo Marks, a WWII cryptographer, suspected that Germans had infiltrated the Dutch network in 1943 because all messages were being sent without any errors. To test his theory, Marks sent a message with “HH” and received “HH” in response. “HH” was a common German sign-off for “Heil Hitler.”

Read more: https://www.theguardian.com/news/2001/feb/02/guardianobituaries.filmnews

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