System for providing a trustworthy user interface

Details System for providing a trustworthy user interface System for providing a trustworthy user interface

2007-11-27

2007-11-27

Moise, Emmanuel L. (Department: 2137)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

C713S190000, C726S020000

Reexamination Certificate

active

09979905

ABSTRACT:
The preferred embodiment of the invention comprises a computer system which employs a trusted display processor (260), which has a trusted processor (300) and trusted memory (305, 315, 335, 345) physically and functionally distinct from the processor and memory of the computer system. The trusted display processor (260) is immune to unauthorised modification or inspection of internal data. It is physical to prevent forgery, tamper-resistant to prevent counterfeiting, and has crypto functions (340) to securely communicate at a distance. The trusted display processor (260) interacts with a user's smartcard (122) in order to extract and display a trusted image, or seal (1000), generate a digital signature of the bitmap of a document image and control the video memory (315) so that other processes of the computer system cannot subvert the image during the signing process. The user interacts with the trusted display processor via a trusted switch (135).

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