Cryptology ePrint Archive: Report 2008/491

A CM construction for curves of genus 2 with p-rank 1

Laura Hitt O'Connor and Gary McGuire and Michael Naehrig and Marco Streng

Abstract: We construct Weil numbers corresponding to genus-2 curves with $p$-rank 1 over the finite field $\F_{p^2}$ of $p^2$ elements. The corresponding curves can be constructed using explicit CM constructions. In one of our algorithms, the group of $\F_{p^2}$-valued points of the Jacobian has prime order, while another allows for a prescribed embedding degree with respect to a subgroup of prescribed order. The curves are defined over $\F_{p^2}$ out of necessity: we show that curves of $p$-rank 1 over $\F_p$ for large $p$ cannot be efficiently constructed using explicit CM constructions.

Category / Keywords: foundations / hyperelliptic curve cryptography

Date: received 20 Nov 2008, last revised 11 May 2010

Contact author: gary mcguire at ucd ie

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Version: 20100511:171521 (All versions of this report)

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