Cryptology ePrint Archive: Report 2021/541

Hardware Deployment of Hybrid PQC

Reza Azarderakhsh and Rami El Khatib and Brian Koziel and Brandon Langenberg

Abstract: In this work, we present a small architecture for quantum-safe hybrid key exchange targeting ECDH and SIKE. This is the first known hardware implementation of ECDH/SIKE-based hybrid key exchange in the literature. We propose new ECDH and EdDSA parameter sets defined over the SIKE primes. As a proof-of-concept, we evaluate SIKEX434, a hybrid PQC scheme composed of SIKEp434 and our proposed ECDH scheme X434 over a new, low-footprint architecture. Both schemes utilize the same 434-bit prime to save area. With only 1663 slices on a small Artix-7 device, our SIKE architecture can compute an entire hybrid key exchange in 320 ms. This is the smallest SIKE architecture in the literature. The hybrid SIKEX434 adds approximately 16% communication overhead and 10% latency overhead over SIKEp434. The additional overhead to support multiple primes indicates the need for new standardized ECC parameters for area-efficient designs in the future.

Category / Keywords: implementation / FPGA, Post-Quantum Cryptography, SIKE

Date: received 23 Apr 2021, last revised 6 May 2021

Contact author: razarder at pqsecurity com

Available format(s): PDF | BibTeX Citation

Version: 20210506:132722 (All versions of this report)

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