Communication Theory of Secrecy Systems

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"Communication Theory of Secrecy Systems" is a paper published in 1949 by Claude Shannon discussing cryptography from the viewpoint of information theory.[1] It is one of the foundational treatments (arguably the foundational treatment) of modern cryptography.[2] His work has been described as a "turning point, and marked the closure of classical cryptography and the beginning of modern cryptography."[3] It is also a proof that all theoretically unbreakable ciphers must have the same requirements as the one-time pad.

Shannon published an earlier version of this research in the formerly classified report A Mathematical Theory of Cryptography, Memorandum MM 45-110-02, Sept. 1, 1945, Bell Laboratories.[4][5] This report also precedes the publication of his "A Mathematical Theory of Communication", which appeared in 1948.

See also[edit]


  1. ^ Shannon, "Communication Theory of Secrecy Systems," p. 656. [1]
  2. ^ Shimeall, Timothy J.; Spring, Jonathan M. (2013). Introduction to Information Security: A Strategic-Based Approach. Syngress. p. 167. ISBN 978-1597499699.
  3. ^ Koç, Çetin Kaya; Özdemir, Funda (2023). "Development of Cryptography since Shannon". Handbook of Formal Analysis and Verification in Cryptography.
  4. ^ A Mathematical Theory of Cryptography
  5. ^ Bibliography of Claude Elwood Shannon


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