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Homophonic Substitution Cipher: Cracking the Code of a Killer πŸ”—

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February 2017
Presenter: Robert Stone
Robert Stone delves into the cipher used by the Zodiac Killer in his newspaper announcements. He describes substitution ciphers and then shows how a homophonic substitution cipher fixes many of its problems. He ends by describing how the Zodiac Killer's cipher was solved.
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