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Preventing SPA/DPA in ECC systems using the Jacobi Form.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Original languageEnglish
Title of host publicationCryptographic Hardware and Embedded Systems - CHES 2001
EditorsKoc , Naccache , Paar
Publisher or commissioning bodySpringer Berlin Heidelberg
Pages391 - 401
Number of pages10
DatePublished - May 2001


In this paper we show how using a representation of an elliptic curve as the intersection of two quadrics in $\PP^3$ can provide a defence against Simple and Differental Power Analysis (SPA/DPA) style attacks. We combine this with a `random window' method of point multiplication and point blinding. The proposed method offers considerable advantages over standard algorithmic techniques of preventing SPA and DPA which usually require a significant increased computational cost, usually more than double. Our method requires roughly a seventy percent increase in computational cost of the basic cryptographic operation, although we give some indication as to how this can be reduced. In addition we show that the Jacobi form is also more efficient than the standard Weierstrass form for elliptic curves in the situation where SPA and DPA are not a concern.

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Conference Proceedings/Title of Journal: CHES 2001

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