CONDITIONAL ACCESS SYSTEM USING PUBLIC KEY INFRASTRUCTURE IN DIGITAL BROADCASTING

摘要

PURPOSE: A CAS(Conditional Access System) using a PKI(Public Key Infrastructure) in digital broadcasting is provided to add an electronic signature technique for bidirectional authentication, an encoding/decoding processing function of transmission information and a PKI certificate management function in a digital broadcasting system. CONSTITUTION: A conditional access server system(100) has a conditional access module(A2) and a certificate process security module(A3). The conditional access module provides a conditional access service. The certificate process security module processes a certificate. A conditional access subscriber system(300) has a conditional access processing module(A4) and a certificate process security module(A5). The conditional access processing module manages conditional access messages and keys transmitted from the conditional access server system. The certificate process security module processes the certificate. An authentication agency(200) has a certificate issuing and processing module(A1) for issuing and processing the certificate.