Patents by Inventor Cecile Delerablee

Cecile Delerablee 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).

  • Cryptographic method with integrated encryption and revocation, system, device and programs for implementing this method
    Patent number: 8121289
    Abstract: A first entity (1) includes a secret encryption key (g1, ?) of an encryption diagram which can accept a plurality of encryption keys. A plurality of decoders have respective encryption keys, each incorporating a respective key index. The method comprises an encryption operation, wherein a value is taken as a variable element (s) and a ciphertext (C?) is calculated from the data to be transmitted (K) and at least from the value taken as the variable element and the secret encryption key. An operation for revoking a decryption key is integrated into an encryption operation performed with a value of the variable element (s) based on the index key (x?) of one of the decryption keys, which will be used during an operation for tracking illegitimate decoders.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: February 21, 2012
    Assignee: France Telecom
    Inventor: Cecile Delerablee
  • Cryptographic method with integrated encryption and revocation, system, device and programs for implementing this method
    Publication number: 20090138704
    Abstract: A first entity (1) includes a secret encryption key (g1, ?) of an encryption diagram which can accept a plurality of encryption keys. A plurality of decoders have respective encryption keys, each incorporating a respective key index. The method comprises an encryption operation, wherein a value is taken as a variable element (s) and a ciphertext (C?) is calculated from the data to be transmitted (K) and at least from the value taken as the variable element and the secret encryption key. An operation for revoking a decryption key is integrated into an encryption operation performed with a value of the variable element (s) based on the index key (x?) of one of the decryption keys, which will be used during an operation for tracking illegitimate decoders.
    Type: Application
    Filed: May 4, 2007
    Publication date: May 28, 2009
    Inventor: Cecile Delerablee