Three gluings of elliptic curves Revised slides

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Three-gluings of elliptic curves (Revised slides) Everett W. Howe Center for Communications Research, La Jolla GeoCrypt 2011 Bastia, Corsica, 20 June 2011 Everett W. Howe Three-gluings of elliptic curves 1 of 29

  • jacobians isogenous

  • e2 over

  • communications research

  • revised slides

  • isomorphism ?


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Everett W. Howe
GeoCrypt 2011 Bastia, Corsica, 20 June 2011
f21o
Three-gluings of elliptic curves (Revised slides)
Center for Communications Research, La Jolla
9
Motivation
Two topics of interest Genus-2 curves with maps to elliptic curves Genus-2 curves with Jacobians isogenous to a product of elliptic curves
These are really the same topic. . .
vEeertt.WHowehTer-elgiugnsfoellipticcurves2of29
A construction
Given: Two elliptic curvesE1,E2over a fieldk An isomorphismψ:E1[n]E2[n]for somen>0, such thatψis an anti-isometry with respect to the Weil pairing
We will produce: A genus-2 curveC(possibly degenerate) Degree-nmapsCE1andCE2
EverettW.HowehTer-elgiugnsfolelipticcruevs3fo29
oweTtW.HeretEvfolenisgg-ulrheef23oesrvcuicptli
E1[n]×E1[n]Weil
µn
Given: Two elliptic curvesE1,E2over a fieldk An isomorphismψ:E1[n]E2[n]for somen>0, such thatψis an anti-isometry with respect to the Weil pairing
We will produce: A genus-2 curveC(possibly degenerate) Degree-nmapsCE1andCE2
9tructionAsnoc//
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