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. 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.[2][3] This report also precedes the publication of his "A Mathematical Theory of Communication", which appeared in 1948.

See also[edit]


  • Shannon, Claude. "Communication Theory of Secrecy Systems", Bell System Technical Journal, vol. 28(4), page 656–715, 1949.
  • Shannon, Claude. "A Mathematical Theory of Cryptography", Memorandum MM 45-110-02, Sept. 1, 1945, Bell Laboratories.


  1. ^ Shannon, "Communication Theory of Secrecy Systems," p. 656. [1]
  2. ^ A Mathematical Theory of Cryptography
  3. ^ Bibliography of Claude Elwood Shannon

External links[edit]