Decoding Simple Substitution Ciphers: An Algorithmic Approach 🔍

PyData Berlin 2018

A historical text may now be unreadable, because its language is unknown, or its script forgotten (or both), or because it was deliberately enciphered. Deciphering needs two steps: Identify the language, then map the unknown script to a familiar one. I’ll present an algorithm to solve a cartoon version of this problem, where the language is known, and the cipher is alphabet rearrangement.

Slides: https://www.slideshare.net/PyData/solving-very-simple-substitution-ciphers-algorithmically-stephen-enrightward
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