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History of cryptography and cryptanalysis. Questions that wish to ask about the history of cryptography should use this tag; if you're asking about historical ciphers you may also wish to use the classical-cipher tag.

25 votes
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Why did Histiaeus tattoo his slave's head?

Exact motives will remain unknown, since we only have Herodotus's word for the whole story, and he doesn't say. However, we can imagine a plausible reason: the whole ordeal provides some level of auth …
Thomas Pornin's user avatar
24 votes
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How long would the 100 Year Cryptography Project have secured its data had it been started 1...

In 1911, there was no computer either. With much more modest goals of security for the next few months, the German army came up with the Enigma, which was broken. Before the 1970s, cryptography was es …
Thomas Pornin's user avatar