An anonymous group posted internet puzzles to recruit code-breakers, then vanished

Keyword: Cryptography

Publisher: Boing Boing

Published: Jun 11, 2026

Cicada 3301 is the name of "three sets of puzzles posted under the name '3301' online between 2012 and 2014." The first appeared on 4chan on January 4, 2012, and ran for nearly a month; a second came… [+919 chars]

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