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IEICE TRANSACTIONS on Fundamentals

Sole Inversion Precomputation for Elliptic Curve Scalar Multiplications

Erik DAHMEN, Katsuyuki OKEYA

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Summary :

This paper presents a new approach to precompute points [3]P, [5]P,..., [2k-1]P, for some k ≥ 2 on an elliptic curve over Fp. Those points are required for the efficient evaluation of a scalar multiplication, the most important operation in elliptic curve cryptography. The proposed method precomputes the points in affine coordinates and needs only one single field inversion for the computation. The new method is superior to all known methods that also use one field inversion, if the required memory is taken into consideration. Compared to methods that require several field inversions for the precomputation, the proposed method is faster for a broad range of ratios of field inversions and field multiplications. The proposed method benefits especially from ratios as they occur on smart cards.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E93-A No.6 pp.1140-1147
Publication Date
2010/06/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E93.A.1140
Type of Manuscript
Special Section PAPER (Special Section on Discrete Mathematics and Its Applications)
Category
Cryptography and Information Security

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