Electronic apparatus with a safe conditional access system (CAS) and control method thereof

摘要

An electronic apparatus is provided, which includes a central processing unit (CPU), a first memory unit which performs communication with the CPU, and a second memory unit which stores therein conditional access system (CAS) software and platform software. According to the method of controlling the apparatus, upon booting, the CPU copies the CAS software to an internal memory area which may be within the CPU, copies the platform software to the first memory unit and executes the CAS and platform software, and executes CAS operations through communication between the CAS software and the platform software.

主权项

1. An electronic apparatus, comprising:
a central processing unit (CPU); a first memory unit configured to communicate with the CPU; and a second memory unit configured to separately store therein conditional access system (CAS) software and platform software, wherein upon booting, the CPU is configured to copy the CAS software to an internal memory area, copy the platform software to the first memory unit and execute the platform software, and execute CAS operations through communication between the CAS software copied to the internal memory area and the platform software copied to the first memory, wherein the internal memory area is a secure RAM (SRAM) area inside the CPU, and is a distinct hardware memory from the first memory unit, wherein the second memory unit further stores therein driver software having an electronic signature, and wherein the CPU copies the driver software to the first memory unit, verifies integrity of the driver software through verification of the electronic signature, and performs communication between the CAS software and the platform software through the verified driver software.