Patents by Inventor Benoit Feix

Benoit Feix has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20100262840
    Abstract: A method of protecting a microcircuit against attacks aimed at discovering secret data used on the execution, by the microcircuit, of an encryption algorithm includes generating at least one protection parameter for the secret data and modifying the execution of the encryption algorithm through that protection parameter. Generation of the at least one protection parameter includes defining a function generating, by successively applying to at least one secret parameter which is stored in memory, a sequence of values which can only be determined from that secret parameter and that function, and to generate the protection parameter in a reproducible way from at least one value in that sequence.
    Type: Application
    Filed: April 28, 2010
    Publication date: October 14, 2010
    Applicant: INSIDE CONTACTLESS
    Inventors: Bruno BENTEO, Benoit FEIX, Sébastien NEROT
  • Publication number: 20100177887
    Abstract: The invention relates to a cryptographic method that incorporates a modular exponentiation secured against hidden channel attacks, without requiring knowledge of the public exponent. The method includes a modular exponentiation and the following steps: drawing of a random value s; initialization of variables with the aid of s; application of an algorithm enabling a loop invariant to be retained by virtue of the properties of the Montgomery multiplier Mgt; unmasking of the result of the algorithm to obtain the signature of the message.
    Type: Application
    Filed: May 2, 2008
    Publication date: July 15, 2010
    Applicant: GEMALTO SA
    Inventors: Mathieu Ciet, Benoit Feix
  • Publication number: 20100014656
    Abstract: A cryptographic method carries out a modular exponentiation of the type C=A<B1> mod N, where A is an operand, B1 is a first exponent, N is a modulus and C is a result. The method includes the steps of masking the operand A by a number s, carrying out a modular exponentiation of the masked operand by the exponent B1, and de masking the result of the exponentiation, by removing a contribution from the random number s from the result of the exponentiation. During the step of masking the operand A, the operand A is multiplied by a parameter of the form K<s.B2>, where K is a constant and B2 is a second exponent such that B1.B2=1 mod N. The method is implemented preferably by using a Montgomery multiplier. The preferred choice for the constant K is K=2P, p being an integer lying between 0 and n, n being an upper bound of the size of the modulus N and conventionally depending on the choice of implementation of the Montgomery multiplication.
    Type: Application
    Filed: December 22, 2006
    Publication date: January 21, 2010
    Applicant: GEMPLUS
    Inventors: Mathieu Ciet, Benoit Feix
  • Publication number: 20090103732
    Abstract: The invention relates to a method for personalizing a secure processor in a NFC system to execute a secure application, comprising steps of obtaining by a server identification data of a user memorized in a secure storage medium, personalization data corresponding to the user identification data, and identification data of a NFC system of the user, comprising an encryption key of the secure processor, encrypting by the server personalization data using the encryption key, transmitting to the NFC system encrypted personalization data, receiving by the secure processor encrypted personalization data, deciphering personalization data, and memorizing in a secured way personalization data by the secure processor.
    Type: Application
    Filed: December 7, 2007
    Publication date: April 23, 2009
    Applicant: INSIDE CONTACTLESS
    Inventors: Bruno Benteo, Benoit Feix, Sebastien Nerot