Unicity Distance of the Zodiac-340 Cipher

Authors

  • Joachim von zur Gathen

DOI:

https://doi.org/10.3384/ecp188395

Keywords:

Historical cryptography, Zodiac cipher, Shannon unicity distance

Abstract

In December 2020, David Oranchak, Jarl Van Eycke, and Sam Blake solved a 51-year old mystery: the Zodiac cipher of 340 symbols. Blake (2021) explains their solution. The correctness of their solution has not been seriously doubted, and here we give a further argument in its favor: the unicity distance of the cipher’s system is between 80 and 152.

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Published

2022-06-09

Issue

Proceedings of the 5th International Conference on Historical Cryptology HistoCrypt 2022

Section

Contents

License

Copyright (c) 2022 Joachim von zur Gathen

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.