Combined Security Analysis of the One- and Three-Pass Unified Model Key Agreement Protocols
The unified model (UM) is a family of key agreement protocols that has been standardized by ANSI and NIST. The NIST standard explicitly permits the reuse of a static key pair among the one-pass and three-pass UM protocols. However, a recent study demonstrated that such reuse can lead to security vulnerabilities. In this paper we revisit the security of the one- and three-pass UM protocols when static key pairs are reused. We propose a shared security model that incorporates the individual security attributes of the two protocols. We then show, provided appropriate measures are taken, that the protocols are secure even when static key pairs are reused.
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