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Playfair cipher
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Introduction References & Edit History Related Topics
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Figure 1: Relative frequency of occurrence of letters in this section and hence in any simple substitution cipher of the text and in a Playfair cipher.
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Playfair cipher: References & Edit History

Article Contributors

Primary Contributors

  • Gustavus J. Simmons
    Former Senior Fellow, National Security Studies, Sandia National Laboratories, Albuquerque, New Mexico; Manager, Applied Mathematics Department, 1971–87. Researcher in command and control of nuclear weapons. Author of numerous articles on cryptology and authentication.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Deleted Web site: None. Mar 05, 2013
Add new Web site: ThinkQuest - Playfair Cipher. Dec 15, 2010
Add new Web site: Public Broadcasting Service - The Playfair Cipher. Dec 15, 2010
New article added. Jul 22, 2009
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