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Title:
A Low-Area Unified Hardware Architecture for the AES and the Cryptographic Hash Function ECHO
Authors: Jean-Luc Beuchat, Eiji Okamoto, Teppei Yamazaki
Abstract:We propose a compact coprocessor for the AES (encryption, decryption, and key expansion) and the cryptographic hash function ECHO on Virtex-5 and Virtex-6 FPGAs. Our architecture is built around a 8-bit datapath. The Arithmetic and Logic Unit performs a single instruction that allows for implementing AES encryption, AES decryption, AES key expansion, and ECHO at all levels of security. Thanks to a careful organization of AES and ECHO internal states in the register file, we manage to generate all read and write addresses by means of a modulo-16 counter and a modulo-256 counter. A fully autonomous implementation of ECHO and AES on a Virtex-5 FPGA requires 193 slices and a single $36$k memory block, and achieves competitive throughputs. Assuming that the security guarantees of ECHO are at least as good as the ones of the SHA-3 finalists BLAKE and Keccak, our results show that ECHO is a better candidate for low-area cryptographic coprocessors. Furthermore, the design strategy described in this work can be applied to combine the AES and the SHA-3 finalist {G}røstl.
ePrint: https://eprint.iacr.org/2011/078
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