Communication Theory of Secrecy Systems

Communication Theory of Secrecy Systems
Author	Claude E. Shannon
Language	English
Subject	Cryptography
Publication date	1949
Publication place	United States

"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 has also been described as turning cryptography from an "art to a science".^[4] It is also a proof that all theoretically unbreakable ciphers must have the same requirements as the one-time pad.

The paper serves as the foundation of secret-key cryptography, including the work of Horst Feistel, the Data Encryption Standard (DES), Advanced Encryption Standard (AES), and more.^[5]

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.^[6]^[7] This report also precedes the publication of his "A Mathematical Theory of Communication", which appeared in 1948.

^ Shannon, "Communication Theory of Secrecy Systems," p. 656. [1]
^ Shimeall, Timothy J.; Spring, Jonathan M. (2013). Introduction to Information Security: A Strategic-Based Approach. Syngress. p. 167. ISBN 978-1597499699.
^ Koç, Çetin Kaya; Özdemir, Funda (2023). "Development of Cryptography since Shannon". Handbook of Formal Analysis and Verification in Cryptography.
^ Zheng, Zhiyong (2022). Modern Cryptography Volume 1: A Classical Introduction to Informational and Mathematical Principle. Financial Mathematics and Fintech. Singapore: Springer Singapore. pp. vi. doi:10.1007/978-981-19-0920-7. ISBN 978-981-19-0919-1.
^ Koç, Çetin Kaya; Özdemir, Funda (2023). "Development of Cryptography since Shannon" (PDF). Handbook of Formal Analysis and Verification in Cryptography: 1–56. doi:10.1201/9781003090052-1. ISBN 978-1-003-09005-2.
^ A Mathematical Theory of Cryptography
^ Bibliography of Claude Elwood Shannon

[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] Zheng, Zhiyong (2022). Modern Cryptography Volume 1: A Classical Introduction to Informational and Mathematical Principle. Financial Mathematics and Fintech. Singapore: Springer Singapore. pp. vi. doi:10.1007/978-981-19-0920-7. ISBN 978-981-19-0919-1.

[:9-5] Koç, Çetin Kaya; Özdemir, Funda (2023). "Development of Cryptography since Shannon" (PDF). Handbook of Formal Analysis and Verification in Cryptography: 1–56. doi:10.1201/9781003090052-1. ISBN 978-1-003-09005-2.

[6] A Mathematical Theory of Cryptography

[7] Bibliography of Claude Elwood Shannon

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