Cryptology ePrint Archive: Report 2008/498

Small Odd Prime Field Multivariate PKCs

Anna Chen an Ming-Shing Chen and Tien-Ren Chen and Chen-Mou Cheng and Jintai Ding and Eric Kuo and Frost Li and Bo-Yin Yang

Abstract: We show that Multivariate Public Key Cryptosystems (MPKCs) over fields of small odd prime characteristic, say 31, can be highly efficient. Indeed, at the same design security of $2^{80}$ under the best known attacks, odd-char MPKC is generally faster than prior MPKCs over \GF{2^k}, which are in turn faster than ``traditional'' alternatives.

This seemingly counter-intuitive feat is accomplished by exploiting the comparative over-abundance of small integer arithmetic resources in commodity hardware, here embodied by SSE2 or more advanced special multimedia instructions on modern x86-compatible CPUs.

We explain our implementation techniques and design choices in implementing our chosen MPKC instances modulo small a odd prime. The same techniques are also applicable in modern FPGAs which often contains a large number of multipliers.

Category / Keywords: implementation / multivariate public key

Date: received 26 Nov 2008, last revised 31 Dec 2008

Contact author: by at crypto tw

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Version: 20081231:071659 (All versions of this report)

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