The security of triple encryption and a framework for code-based game-playing proofs. (English) Zbl 1140.94321

Vaudenay, Serge (ed.), Advances in cryptology – EUROCRYPT 2006. 25th annual international conference on the theory and applications of cryptographic techniques, St. Petersburg, Russia, May 28 – June 1, 2006. Proceedings. Berlin: Springer (ISBN 3-540-34546-9/pbk). Lecture Notes in Computer Science 4004, 409-426 (2006).
Summary: We show that, in the ideal-cipher model, triple encryption (the cascade of three independently-keyed blockciphers) is more secure than single or double encryption, thereby resolving a long-standing open problem. Our result demonstrates that for DES parameters (56-bit keys and 64-bit plaintexts) an adversary’s maximal advantage against triple encryption is small until it asks about \(2^{78}\) queries. Our proof uses code-based game-playing in an integral way, and is facilitated by a framework for such proofs that we provide.
For the entire collection see [Zbl 1108.94002].


94A60 Cryptography
Full Text: DOI


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