Secure software registration and integrity assessment in a compu

Details Secure software registration and integrity assessment in a compu Secure software registration and integrity assessment in a compu

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.

REFERENCES:
patent: 5421006 (1995-05-01), Jablon et al.
patent: 5537540 (1996-07-01), Miller et al.
patent: 5657445 (1997-08-01), Pearce
patent: 5694569 (1997-12-01), Fischer
patent: 5694582 (1997-12-01), Pearce
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.

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