Disguising tori and elliptic curves

Abstract

Frey proposed the idea of ‘disguising’ an elliptic curve. This is a method to obtain a ‘black box’ representation of a group. We adapt this notion to finite fields and tori and study the question of whether such systems are secure. Our main result is an algebraic attack which shows that it is not secure to disguise the torus T2. We also show that some… (More)

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