초록 ▼

An executable interactive program is combined with audio/video data for transmission. The program is divided into modules, similar to computer files, and a Directory Module is created which links program modules. Security for the executable application is provided by attaching a signed certificate t

An executable interactive program is combined with audio/video data for transmission. The program is divided into modules, similar to computer files, and a Directory Module is created which links program modules. Security for the executable application is provided by attaching a signed certificate to respective Directory Modules. The integrity of respective modules is monitored by hashing respective modules and including respective hash values in the Directory Module. A hash value of the Directory Module containing the other hash values is generated, encrypted and attached to the Directory Module. At a receiver the certificate is decoded and checked for authenticity of provider. If the certificate is authentic the program may be executed but only if receiver generated hash values of respective program modules are identical to corresponding hash values contained in the Directory Module.

대표청구항 ▼

Apparatus for receiving an executable application transmitted in modules including a Directory Module containing information about further modules, said Directory Module having at least an encrypted hash value over the Directory Module and an encrypted certificate appended, which certificate include

Apparatus for receiving an executable application transmitted in modules including a Directory Module containing information about further modules, said Directory Module having at least an encrypted hash value over the Directory Module and an encrypted certificate appended, which certificate includes an identity of the application provider, said apparatus comprising: a memory a detector for detecting said transmitted modules and storing detected modules in memory; means for separating said certificate from a detected Directory Module; a decryptor for decrypting said certificate and said encrypted hash value; a hash function element for hashing said detected Directory Modules to produce a further hash value; a processor programmed for authenticating decrypted said certificate, and comparing decrypted said hash value with said further hash value, and if decrypted said hash value and said further hash value are equal and said certificate is authentic, permitting execution of said program.