Patent ID: 8621218
Filing Date: 2013-12-31
Classification: H04L,H04N

Abstract:
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.