METHOD FOR DOWNLOADING CONDITIONAL ACCESS SYSTEM FOR DIGITAL BROADCASTING

摘要

The present invention provides a method for downloading a conditional access system in a broadcasting system in which a transmitter has a DCAS authentication proxy (AP), a personalization server, a DCAS provisioning server, and a head end, and in a digital broadcasting system in which a receiver has a set-top box including a DCAS host. The method for downloading a conditional access system for a digital broadcasting comprises (A) a mutual authentication between the DCAS AP and the DCAS host and key distribution process, (B) a mutual authentication between the DCAS personalization server and the DCAS host and key distribution process, and (C) a mutual authentication between the DCAS provisioning server and the DCAS host and key distribution process. The mutual authentication between the DCAS AP and the DCAS host and key distribution process includes: 1) a step of generating a common key from the license number input in the set-top box, 2) a step of performing a mutual authentication between the DCAS AP and the DCAS host by using the common key, and 3) a step of permitting the DCAS AP to generate a temporary key (TK) and distribute the generated key to the DCAS host and the personalization server, when the mutual authentication is finished. The mutual authentication between the DCAS personalization server and the DCAS host and key distribution process includes: 1) a step of performing a mutual authentication between the personalization server and the DCAS host by using the temporary key, and 2) a step of permitting the personalization server to generate a session key (SK) and distribute the generated key to the DCAS host and the DCAS provisioning server, when the mutual authentication is finished. The mutual authentication between the DCAS provisioning server and the DCAS host and key distribution process includes: 1) a step of permitting the DCAS provisioning server to encode a conditional access system software by using the session key (SK) and transmitting the encoded software to the DCAS host, and 2) a step of permitting the DCAS host to decode the conditional access system software by using the session key (SK) and installing the software.