International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 23 February 2014

Mohammad Sadeq Dousti, Rasool Jalili
ePrint Report ePrint Report
This paper suggests a model and a definition for forward-secure authenticated key exchange (AKE) protocols, which can be satisfied without depending on the Diffie-Hellman assumption. Protocols conforming to our model can be highly efficient, since they do not require the resource-intensive modular exponentiations of the Diffie-Hellman protocol. The basic idea is to use key-evolving schemes (KES), where the long-term keys of the system get updated regularly and irreversibly. We also introduce a protocol, called FORSAKES, and prove rigorously that it is a forward-secure AKE protocol in our model. FORSAKES is a very efficient protocol, and can be implemented by merely using hash functions.

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