Method and apparatus for controlling using checksums execution o

Details Method and apparatus for controlling using checksums execution o Method and apparatus for controlling using checksums execution o

1995-04-13

1997-01-28

Lim, Krisna

Excavating

371 201, 371 377, G06F 1100, G06F 1110

Patent

active

055985300

ABSTRACT:
A program execution control device for a computer system is provided for improving the reliability of program execution. A first calculating unit calculates, as a first checksum, the checksum of data which is already stored in main memory before an object program is loaded into the main memory. A program copying unit makes a copy of the object program stored in a storage unit and loads the copy into the main memory. An adding unit acquires, as a second checksum, a checksum of the object program, which checksum is obtained previously when the object program is compiled and is affixed to the object program as auxiliary data, and adds together the second checksum and the first checksum to obtain a third checksum. A second calculating unit calculates, as a fourth checksum, the checksum of data stored in the main memory after the object program is loaded into the main memory. An execution control unit compares the third checksum with the fourth checksum. The execution control unit executes the object program when the third and fourth checksums coincide, and inhibits execution of the object program when the third and fourth checksums do not coincide.

REFERENCES:
patent: 4142243 (1979-02-01), Bishop et al.
patent: 4519077 (1985-05-01), Amin
patent: 4914576 (1990-04-01), Zelley et al.
patent: 5022077 (1991-06-01), Bealkowski et al.
patent: 5050212 (1991-09-01), Dyson
patent: 5319651 (1994-06-01), Eder et al.
patent: 5328278 (1994-07-01), Kokubo
Fred Cohen "A Crytographic Checksum for Integrity Production" Dec. 1987.
Russell Davis "Exploring Computer Viruses" 1988 Ford Aerospace Space Missions Group.
S. J. Phillippo "Practical Virus Detection and Prevention" 1990.
Jackson, Keith "Checkson Methods Used to Detect Virus Attacks" Virus Bulletin Sep. 1989 pp. 7-8.

Affiliated with

Also associated with

Rating

Method and apparatus for controlling using checksums execution o does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for controlling using checksums execution o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for controlling using checksums execution o will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-947199