METHOD FOR CONVERTING EMM IN CAS WITH PKI

摘要

PURPOSE: A method for converting an EMM(Entitlement Management Message) in a CAS(Conditional Access System) with a PKI(Public Key Infrastructure) is provided to solve problems of a CAS with a symmetric key scheme. CONSTITUTION: A CAS(207) connects to a subscriber management system(206), reads each subscriber information from a database through the subscriber management system(206), and transmits subscriber information to a CA(Certificate Authority) server(202) according to a certificate policy. The CAS(207) transmits a certificate request form including a public key of electronic signature keys stored in the database to the CA server(202). The subscriber management system(206) records a certificate issued from the CA server(202) and a subscriber's private key stored in the database in a conditional access module through a recording device(204).