Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Protection at a particular protocol layer
Patent
1996-07-11
1999-08-31
Palys, Joseph E.
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Protection at a particular protocol layer
713202, G06F 1100
Patent
active
059448210
ABSTRACT:
A method for providing secure registration and integrity assessment of software in a computer system is disclosed. A secure hash table is created containing a list of secure programs that the user wants to validate prior to execution. The table contains a secure hash value (i.e., a value generated by modification detection code) for each of these programs as originally installed on the computer system. This hash table is stored in protected memory that can only be accessed when the computer system is in system management mode. Following an attempt to execute a secured program, a system management interrupt is generated. An SMI handler then generates a current hash value for the program to be executed. In the event that the current hash value matches the stored hash value, the integrity of the program is guaranteed and it is loaded into memory and executed. If the two values do not match, the user is alerted to the discrepancy and may be given the option to update or override the stored hash value by entering an administrative password.
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patent: 5657445 (1997-08-01), Pearce
patent: 5694569 (1997-12-01), Fischer
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Intel486.TM. SL Microprocessor SuperSet System Design Guide, Nov. 1992, pp. 12-14 through 12-29.
Intel486.TM. SL Microprocessor SuperSet Programmer's Reference Manuel, Nov. 1992, pp. 6-28 through 6-53.
Compaq Computer Corporation
Palys Joseph E.
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