Procede de determination d'une cle de cryptage associee a un circuit integre

Abstract

<P>Procédé de détermination d'une clé de cryptage associée à un circuit intégré (10) présentant un plan-mémoire (11).<BR/>Selon l'invention, le procédé comporte les étapes suivantes:<BR/>(a) réaliser une matrice de N contacts électriques Ci (i = 1, ..., N) à la surface dudit plan-mémoire (11),<BR/>(b) déposer sur ladite matrice une couche (14) d'un matériau à résistivité électrique inhomogène aléatoire,<BR/>(c) déterminer ladite clé de cryptage, dite clé résistive Kr, à partir de la répartition aléatoire des résistances électriques reliant les différents contacts électriques Ci de la matrice.<BR/>Application à la sécurisation des cartes à mémoire utilisées en télévision cryptée.</P>
A method for determining an encryption key associated with an integrated circuit (10) having a memory plane (11) is disclosed. The method comprises the steps of (a) forming a matrix of N electrical contacts Ci (i = 1, ..., N) on the surface of said memory plane (11), (b) depositing a layer (14) of a material having random inhomogeneous electrical resistivity on said matrix, and (c) determining said encryption key or resistive key Kr on the basis of the random distribution of electrical resistances connecting the various electrical contacts Ci of the matrix. The method is useful for protecting smart cards used in coded television services.

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    FR-2875949-A1March 31, 2006St Microelectronics SaVerrouillage d'un circuit integre
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    US-8879724-B2November 04, 2014Rambus Inc.Differential power analysis—resistant cryptographic processing
    US-9419790-B2August 16, 2016Cryptography Research, Inc.Differential power analysis—resistant cryptographic processing
    US-9852572-B2December 26, 2017Cryptography Research, Inc.Cryptographic token with leak-resistant key derivation
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