Papers › Faster Multiplication for Long Binary Polynomials
Faster Multiplication for Long Binary Polynomials
Ming-Shing Chen, Chen-Mou Cheng, Po-Chun Kuo, Wen-Ding Li, Bo-Yin Yang
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We set new speed records for multiplying long polynomials over finite fields of characteristic two. Our multiplication algorithm is based on an additive FFT (Fast Fourier Transform) by Lin, Chung, and Huang in 2014 comparing to previously best results based on multiplicative FFTs. Both methods have similar complexity for arithmetic operations on underlying finite field; however, our implementation shows that the additive FFT has less overhead. For further optimization, we employ a tower field construction because the multipliers in the additive FFT naturally fall into small subfields, which leads to speed-ups using table-lookup instructions in modern CPUs. Benchmarks show that our method saves about 40 % computing time when multiplying polynomials of 2²⁸ and 2²⁹ bits comparing to previous multiplicative FFT implementations.
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