International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 26 May 2015

Jiajun Zhang, Haining Fan
ePrint Report ePrint Report
By selecting the largest possible value of k ∈ (n/2,2n/3], we further reduce the AND and XOR gate complexities of the CRT-based hybrid parallel GF(2^n) polynomial pasis multipliers for the irreducible trinomial f = u^n + u^k + 1 over GF(2): they are always less than those of the current fastest parallel multipliers - quadratic multipliers, i.e., n^2 AND gates and n^2−1 XOR gates. Our experimental results show that among the 539 values of n ∈ [5,999] such that f is irreducible for some k ∈ [2,n−2], there are 317 values of n such that k ∈ (n/2,2n/3]. For these irreducible trinomials, the AND and XOR gate complexities of the CRT-based hybrid multipliers are reduced by 15.3% on average. Especially, for the 124 values of such n, the two kinds of multipliers have the same time complexity, but the space complexities are reduced by 15.5% on average. As a comparison, the previous CRT-based multipliers consider the case k ∈ [2,n/2], and the improvement rate is only 8.4% on average.

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