Cryptography – Cryptanalysis
Patent
1994-04-25
1997-01-28
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 9, 380 23, 380 25, 380 49, 380 50, H04L 932, H04L 900
Patent
active
055984703
ABSTRACT:
A method and apparatus is provided in a data processing system for securing access to particular files which are stored in a computer-accessible memory media. A file management program is provided as an operating system component of the data processing system. A plurality of files are stored in a computer-accessible memory media, including at least one encrypted file and at least one unencrypted file. For each encrypted file, a preselected portion of the file is recorded in memory, a decryption block is generated which includes information which can be utilized to decrypt the file, and the decryption block is incorporated in the file in lieu of the preselected portion which has been recorded in memory. Then, a file management program is utilized to monitor data processing system calls for files stored in the computer-accessible memory media. The file management program determines whether the called file has an associated decryption block. The called file is processed in a particular manner dependent upon whether or not the called file has an associated decryption block.
REFERENCES:
patent: 4864616 (1989-09-01), Pond et al.
patent: 4888798 (1989-12-01), Earnest
patent: 5021997 (1991-06-01), Archie et al.
patent: 5155847 (1992-10-01), Kirouac et al.
patent: 5166886 (1992-11-01), Molnar et al.
patent: 5341429 (1994-08-01), Stringer et al.
"Data Masking Algorithm" (IBM Technical Disclosure Bulletin, vol. 32 No. 68, Nov. 1989).
"Information Distribution via Rom Disks" (IBM Technical Disclosure Bullletin, vol. 33 No. 12, May 1991).
Cooper Thomas E.
Philips Hudson W.
Pryor Robert F.
Bumgardner Barry J.
Dillon Andrew J.
Duffield Edward H.
Gregory Bernarr E.
International Business Machines - Corporation
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