Cryptography – Cryptanalysis
Patent
1990-02-26
1991-04-09
Cangialosi, Salvatore
Cryptography
Cryptanalysis
380 25, H04L 906
Patent
active
050070827
ABSTRACT:
Data security is provided using an encryption/decryption algorithm which attaches at the primitive BIOS level of the operating system automatically during the power-on self-test routines. The encryption/decryption process is implemented by intercepting the removable media or floppy diskette interrupt in order to add additionasl interrupt ahandling routing instructions which perform the encryption and decryption of data passed between the diskette controller and the data transfer buffer area within system RAM. Bitwise alteratio of the data in a predefined relationship is used to encrypt and decrypt. The encryption/decryption system sttaches before the computer power-up sequence renders data entry hardware active, hence the user cannot readily override the secrity system. Data stored on nonremovable media such as hard disk media is not encrypted, thereby preserving the integrity of more permanent data.
REFERENCES:
patent: 4120030 (1978-10-01), Johnstone
patent: 4168396 (1979-09-01), Best
patent: 4306289 (1981-12-01), Lumley
patent: 4352952 (1982-10-01), Boone et al.
patent: 4433207 (1984-02-01), Best
patent: 4685056 (1987-08-01), Barnsdale, Jr. et al.
patent: 4698617 (1987-10-01), Bauer
patent: 4764959 (1988-08-01), Watanabe et al.
patent: 4905277 (1990-02-01), Nakamura
"Security Systems Rescue Data Form Snoopers, user Blunders, From Working Smarter", PC Week, vol. 5, p. 40, Feb. 16, 1988, by Lante Corp.
"Encryption Methods, Enhancing Data Security on the PC", Victor Mansfield, PC Tech. Journal, Apr. 1985, pp. 96-114.
"Encryption Methods Part 2", Victor Mansfield, PC Tech Journal, May 1985, pp. 157-167.
"Encryption Software", Victor Mansfield, PC Tech. Journal, Jun. 1985, pp. 162-179.
Cangialosi Salvatore
Kelly Services, Inc.
LandOfFree
Computer software encryption apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Computer software encryption apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Computer software encryption apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2040800