Common Contracts
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PQDH: A Quantum-Safe Replacement for Diffie-Hellman based on SIDHJuly 18th, 2019
Abstract. We present a post-quantum key agreement scheme that does not re- quire distinguishing between the initiator and the responder. This scheme is based on elliptic curve isogenies and can be viewed as a variant of the well-known SIDH protocol. Then, we present an efficient countermeasure against a side-channel at- tack that applies to both static and ephemeral versions of SIDH and our scheme. Finally, we show how to obtain an isogeny-based password-authenticated key ex- change protocol based on our scheme by applying a construction shown in [16]. Security and computational complexities summaries are also presented.
