Patents by Inventor Stéphane Rainsard

Stéphane Rainsard 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).

  • Method to secure the execution of a program against attacks by radiation or other
    Patent number: 7844828
    Abstract: A method for verifying execution of a program, wherein the program comprises a first code portion and a second code portion. The method includes entering the first code portion, where the first code portion includes a first plurality of instructions, executing the first code portion, calculating a first checksum during the execution of the first code portion, wherein the first checksum is calculated using information associated with at least one of the first plurality of instructions, comparing the first checksum to a first pre-calculated checksum prior to exiting the first code portion, and exiting the first code portion and entering the second code portion if the first checksum equals the first pre-calculated checksum.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: November 30, 2010
    Assignee: Axalto SA
    Inventors: Nicolas Giraud, Stéphane Rainsard
  • Method and device for encryption and decryption on the fly
    Publication number: 20070106907
    Abstract: A method for protecting a datum, wherein the datum is encrypted and, prior to sending the datum to a recipient, the datum is divided into at least a first block and a second block. The method includes receiving, at the recipient, the first block; decrypting the first block to obtain a decrypted first block, re-encrypting the decrypted first block to obtain a re-encrypted first block using an encryption algorithm, prior to decrypting the second block, receiving, at the recipient, the second block, decrypting the second block to obtain a decrypted second block; and re-encrypting the decrypted second block to obtain a re-encrypted second block using the encryption algorithm, wherein the first block and the second block are transmitted individually to the recipient.
    Type: Application
    Filed: December 2, 2004
    Publication date: May 10, 2007
    Applicant: AXALTO S.A.
    Inventors: Stephane Rainsard, Cyrille Pepin
  • Method to secure the execution of a program against attacks by radiation or other
    Publication number: 20070106519
    Abstract: A method for verifying execution of a program, wherein the program comprises a first code portion and a second code portion. The method includes entering the first code portion, where the first code portion includes a first plurality of instructions, executing the first code portion, calculating a first checksum during the execution of the first code portion, wherein the first checksum is calculated using information associated with at least one of the first plurality of instructions, comparing the first checksum to a first pre-calculated checksum prior to exiting the first code portion, and exiting the first code portion and entering the second code portion if the first checksum equals the first pre-calculated checksum.
    Type: Application
    Filed: December 6, 2004
    Publication date: May 10, 2007
    Inventors: Nicolas Giraud, Stephane Rainsard