Idemia Identity & Security France

Idemia Identity & Security

Roch Olivier Lescuyer De Chaptal-Lamure

Julien Bringer

Herve Chabanne

Hervé Chabanne

Victor Servant

Emmanuel Prouff

Eduardo Soria-Vazquez

A method for encrypting or decrypting a n-tuple of data ({a}) with a n-tuple of secret keys ({k}). The method uses a data-processor to perform the steps of: (a) for each element (a), determining m&#x3e;n first internal states ({y}) by application of m first operations, each: represented by a table (T), and defined as the combination of a single bijective internal encoding (G), of a non-linear sharing function (D, E, F. . . ), and of a given non-linear permutation function (&#x192;) parameterized with the secret key (k), and (b) for each n-tuple of first internal states ({y}), determining a second internal state (z) by application of a second operation: represented by a table (T), and defined as the combination of a second single bijective internal encoding (G), a linear multiplexing function (L), and the inverses of the first bijective internal encodings (G).

Method for encrypting or decrypting a n-tuple of data with a n-tuple of predetermined secret keys

A biometric identification method of an entity including computation of a matching value between biometric data of an entity u and reference biometric data u', by application of a function F to the biometric data. A non-interactive, publicly verifiable computation method is performed wherein representation of the function is obtained by converting an arithmetic circuit into a polynomial representation. A matching value is obtained by evaluating the arithmetic circuit and the reference biometric data as inputs. Proof of correction of the computation execution of the matching values is obtained. Verification of said received proof. The function is encoded with an integer k&#x3e;1 of a vector of a biometric datum on at least one input wire of the circuit. The function includes at least m scalar products. Evaluation of the circuit is iteratively computed depending on the value of m.

Identification method of an entity

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Issy les Moulineaux, France

Roch Olivier Lescuyer De Chaptal-Lamure