Fast Multibase Methods and Other Several Optimizations for Elliptic Curve Scalar Multiplication
Irvine Proceedings of the 12th International Conference on Practice and Theory in Public Key Cryptography: PKC '09
AAECC'07 Proceedings of the 17th international conference on Applied algebra, algebraic algorithms and error-correcting codes
Extended double-base number system with applications to elliptic curve cryptography
INDOCRYPT'06 Proceedings of the 7th international conference on Cryptology in India
ISC'07 Proceedings of the 10th international conference on Information Security
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Finding multiples of points on elliptic curves is the most important computation in elliptic curve cryptography. Extending the work of C. Doche, T. Icart, and D. Kohel (Efficient scalar multiplication by isogeny decomposition, in: M. Yung, Y. Dodis, A. Kiayias, T.G. Malkin (Eds.), Public Key Cryptography 2006, in: Lecture Notes in Comput. Sci., vol. 3958, Springer, Heidelberg, 2006, pp. 191-206) we use 5-isogenies to compute multiples of a point on an elliptic curve. Specifically, we find explicit formulas for quintupling a point. We compare the results with other published formulas for quintupling. We find that when the point is represented in Jacobian coordinates with z=1, our method is potentially among the fastest on specially chosen elliptic curves. We also see that using l-isogenies to compute the multiplication by l map (for l larger than five) is unlikely to be more efficient than other techniques.