Secure open smart card architecture

Details Secure open smart card architecture Secure open smart card architecture

1997-12-30

1999-12-14

Hua, Ly V.

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Protection at a particular protocol layer

380 4, 380 23, 380 24, 380 25, 380 49, 709100, H04L 900

Patent

active

060031344

ABSTRACT:
Multiple applications upon an IC microprocessor are protected with bi-modal CPU operation, either application or system mode, using an operation flag determining the mode and dependent upon a mode change interrupt which clears all working memory unnecessary to operation in the next mode. Access authorization setting program and data memory boundaries according to the particular custom command in comparison registers is utilized in application initialization. From application mode, data files are accessed only through a system subroutine. Request of an address beyond the territory assigned to the custom command utilized results in a hardware interrupt which clears all working memory and registers unnecessary to forward a status word indicating abnormal termination. Application completion forwards the result with a status word indicating successful completion. Operation results either in successful completion or abnormal termination without possible access of any other application contained upon the IC card (10).

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