APPARATUS AND METHOD FOR CERTIFYING APPLICATION TRANSMITTED THROUGH BI-DIRECTIONAL INFORMATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide the receiving method and device for a 2-way television system to receive only permitted data. SOLUTION: A 2-way program is coupled with transmission audio/video data, resulting data are divided into modules and a directory module to kink the modules is generated 49. Security of an application is obtained by addition of signed certificate to each directory and the completeness of a module is monitored by applying hash processing to each module and storing the hashed value to the directory. The hashed value of the directory including other hash values is ciphered and added to the directory 54. The certificate is decoded by receiver, a certificate of a provider is checked and a program is executed so long as the has value of each program generated by a receiver matches a corresponding to has value of the directory when the certificate is verified.