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Two-Factor Authentication LRP-AKE, Revisited

As two-factor authentication, Shin et al., proposed a leakage-resilient and proactive authenticated key exchange (LRP-AKE) protocol for credential services which provides not only a higher level of security against leakage of stored secrets but also secrecy of private key with respect to the involving server. In this paper, we discuss the security proof of the LRP-AKE protocol in detail, and show its several extensions and performance evaluation with the elliptic curve domain parameters. From the performance evaluation, we can confirm that the LRP-AKE protocol has almost same efficiency as the (plain) Diffie-Hellman protocol that does not provide authentication at all.