Endomorphisms for Faster Elliptic Curve Cryptography on a Large Class of Curves

  • Authors:
  • Steven D. Galbraith;Xibin Lin;Michael Scott

  • Affiliations:
  • Mathematics Department, Royal Holloway, University of London, Egham, Surrey, United Kingdom TW20 0EX;School of Mathematics and Computational Science, Sun Yat-Sen University, Guangzhou, P.R. China 510275;School of Computing, Dublin City University, Ballymun, Dublin 9, Ireland

  • Venue:
  • EUROCRYPT '09 Proceedings of the 28th Annual International Conference on Advances in Cryptology: the Theory and Applications of Cryptographic Techniques
  • Year:
  • 2009

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Abstract

Efficiently computable homomorphisms allow elliptic curve point multiplication to be accelerated using the Gallant-Lambert- Vanstone (GLV) method. We extend results of Iijima, Matsuo, Chao and Tsujii which give such homomorphisms for a large class of elliptic curves by working over ${\mathbb F}_{p^2}$ and demonstrate that these results can be applied to the GLV method. In general we expect our method to require about 0.75 the time of previous best methods (except for subfield curves, for which Frobenius expansions can be used). We give detailed implementation results which show that the method runs in between 0.70 and 0.84 the time of the previous best methods for elliptic curve point multiplication on general curves.