Patents by Inventor Sylvain Delagrange

Sylvain Delagrange 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 and system for secured broadcasting of a digital data stream
    Patent number: 8798269
    Abstract: A method and system for secured broadcasting of a digital data flow between a technical platform (1) and at least one terminal (2), characterized in that it comprises the following steps: transmitting a scrambled and multiplexed digital data flow with at least one message (ECM) including a control key (CW) encrypted by a channel key (CC); descrambling in a secured memory area of the terminal (2) the scrambled digital data flow from the control key (CW) obtained according to the following substeps; sending to the technical platform (1) a request including the identifier (IUi) of the terminal (2); generating a secret key (CSk) from a cryptographic mechanism (A) using a single ciphering key (BSKn) and the identifier (IUi) of the terminal (2) with view to ciphering said channel key (CC) and obtaining a message (eCCk); deciphering the message (eCCk) received by a terminal (2) from the key (CSk) initially stored in the terminal (2) so as to obtain the channel key (CC), and obtaining the control key (CW) resulti
    Type: Grant
    Filed: March 16, 2011
    Date of Patent: August 5, 2014
    Assignee: Bouygues Telecom
    Inventors: Sylvain Delagrange, Jakub Pieniazek
  • METHOD AND SYSTEM FOR SECURED BROADCASTING OF A DIGITAL DATA STREAM
    Publication number: 20130058484
    Abstract: A method and system for secured broadcasting of a digital data flow between a technical platform (1) and at least one terminal (2), characterized in that it comprises the following steps: transmitting a scrambled and multiplexed digital data flow with at least one message (ECM) including a control key (CW) encrypted by a channel key (CC); descrambling in a secured memory area of the terminal (2) the scrambled digital data flow from the control key (CW) obtained according to the following substeps; sending to the technical platform (1) a request including the identifier (IUi) of the terminal (2); generating a secret key (CSk) from a cryptographic mechanism (A) using a single ciphering key (BSKn) and the identifier (IUi) of the terminal (2) with view to ciphering said channel key (CC) and obtaining a message (eCCk); deciphering the message (eCCk) received by a terminal (2) from the key (CSk) initially stored in the terminal (2) so as to obtain the channel key (CC), and obtaining the control key (CW) resulti
    Type: Application
    Filed: March 16, 2011
    Publication date: March 7, 2013
    Inventors: Sylvain Delagrange, Jakub Pieniazek