| 摘要 |
The invention concerns a countermeasure method in an electronic component using a public key cryptographic algorithm on a specific elliptic curve E on a body IK, comprising an exponential computation of Q=d.P type where P and Q are points of the specific elliptic curve (E), and d a predetermined, comprising the following steps: drawing a non-null random number u, element of the finite body IK, to define randomly an isomorphic elliptic curve Eu'; computation of co-ordinates of a point P' on said isomorphic elliptic curve Eu', image of the point P; applying an exponentiation algorithm to said point image P' on said isomorphic elliptic curve Eu', to obtain a resulting point Q'; computation of co-ordinates on the specific elliptic curve E of point Q, pre-image of the resulting point Q'.
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