Cryptology ePrint Archive: Report 2002/065

Secure Channels based on Authenticated Encryption Schemes: A Simple Characterization

Chanathip Namprempre

Abstract: We consider communication sessions in which a pair of parties begin by running an authenticated key-exchange protocol to obtain a shared session key, and then secure successive data transmissions between them via an authenticated encryption scheme based on the session key. We show that such a communication session meets the notion of a secure channel protocol proposed by Canetti and Krawczyk if and only if the underlying authenticated encryption scheme meets two new, simple definitions of security that we introduce, and the key-exchange protocol is secure. In other words, we reduce the secure channel requirements of Canetti and Krawczyk to easier to use, stand-alone security requirements on the underlying authenticated encryption scheme.

Category / Keywords: secret-key cryptography / Secure Channels, authenticated encryption, security notions

Publication Info: Advances in Cryptography --- Asiacrypt 2002

Date: received 28 May 2002, last revised 29 Aug 2002

Contact author: meaw at cs ucsd edu

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Version: 20020829:233535 (All versions of this report)

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