Abstract
Three-party password-based authenticated key exchange (3PAKE) protocol is an important practical cryptographic primitive in the client-client communication environments, where two clients could generate a shared secure session key using their human-memorable passwords with a server’s help. Many 3PAKE protocols were proposed, but these protocols were only secure in the traditional model where no leakage attacks exist. In Mobile Internet, Wireless Networks and Sensor Networks environments, 3PAKE systems are very vulnerable to side-channel attacks. Therefore, it is very necessary to design 3PAKE protocols that are secure in the leakage environments. However, there is no previous works for formalizing the security model for leakage-resilient (LR) 3PAKE and designing the LR 3PAKE protocols. In the paper, we first define a continuous after-the-fact LR eCK-security model for 3PAKE and propose a LR 3PAKE protocol, then present a formal security proof in the standard model.
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