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SECURELY PROVIDING A CONTROL WORD FROM A SMARTCARD TO A CONDITIONAL ACCESS MODULE

  • US 20100211797A1
  • Filed: 02/10/2010
  • Published: 08/19/2010
  • Est. Priority Date: 02/13/2009
  • Status: Abandoned Application
First Claim
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1. A method for securely providing a control word from a smartcard to a conditional access module of a receiver, the receiver being configured for interaction with a user, the method comprising the steps in the smartcard of:

  • obtaining diversification data from at least one of the smartcard and the conditional access module, the diversification data being dependent on the user interaction;

    generating an encryption key using a diversification function having as input the diversification data and having as output the encryption key;

    encrypting the control word using the encryption key to obtain an encrypted control word;

    if the diversification data is obtained from the smartcard, providing the diversification data to the conditional access module for generating a decryption key to decrypt the encrypted control word; and

    providing the encrypted control word to the conditional access module.

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