Provably Insecure Mutual Authentication Protocols: The Two-Party Symmetric-Encryption Case
Author(s): Jim Alves-Foss

Date: October 1999
Publication: 22nd National Information Systems Security Conference
Source 1: http://csrc.nist.gov/nissc/1999/proceeding/papers/p25.pdf

Abstract or Summary:
In practice, users will rely on a wide variety of communication protocols to conduct their work over the Internet. This paper discusses the security ramifications of using multiple authentication protocols. We demonstrate multi-protocol attacks and how they can be realized to defeat otherwise secure authentication protocols. We highlight this discussion with examples of attacks on a proposed symmetric key-based authentication protocols. We present a model of communication that reflects the existence of this type of attack, and demonstrate that a class of authentication protocols can never be secure in the presence of this type of attack.



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