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Method and apparatus for mutual authentication in downloadable conditional access system

  • US 8,621,218 B2
  • Filed: 12/09/2008
  • Issued: 12/31/2013
  • Est. Priority Date: 12/10/2007
  • Status: Active Grant
First Claim
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1. A method for mutual authentication of a secure microprocessor (SM) in a Downloadable Conditional Access System (DCAS) comprising:

  • receiving at a SM session key generation information from an authentication server;

    receiving at the SM a SecurityAnnounce message from the authentication server, obtaining a public key of the authentication server from the SecurityAnnounce message, and verifying the SecurityAnnounce message;

    receiving at the SM a DCASDownload message from the authentication server;

    deriving at the SM a first shared-session key from the session key generation information, and transmitting a ClientSignOn message for the derived first shared-session key to the authentication server;

    receiving at the SM a ClientSignOnConfirm message for a second shared-session key derived from the ClientSignOn message of the authentication server; and

    verifying at the SM whether the first shared-session message and the second shared-session message are identical with each other based on the ClientSignOnConfirm message so as to generate a mutual authentication result, and receiving at the SM Conditional Access System (CAS) software from a headend system based on the mutual authentication result.

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