Apparatus and method for authenticating transmitting applications in an interactive TV system

Patent 5625693 Issued on April 29, 1997. Estimated Expiration Date:

July 7, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

Thomson Consumer Electronics, Inc.

Application

No. 499280 filed on 07/07/1995

US Classes:

713/187, COMPUTER PROGRAM MODIFICATION DETECTION BY CRYPTOGRAPHY380/212Plural video stream multiplexing

Examiners

Primary: Tarcza, Thomas H.
Assistant: White, Carmen D.

Attorney, Agent or Firm

Tripoli; Joseph S., Herrmann; Eric P., Kurdyla; Ronald H.

Foreign Patent References

WO92/14318 WO 08/21/1992
95/15655 WO 06/21/1995

International Class

H04L 009/32

Abstract

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.