Execution protection for floppy disks

Details Execution protection for floppy disks Execution protection for floppy disks

1990-05-07

1991-06-25

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 3, 360 60, H04L 900

Patent

active

050273965

ABSTRACT:
The method of permitting the execution of a disk loaded into the disk drive, the disk having a plurality of tracks, comprising the steps of writing data in non-standard format and length to a normally unaccessible track of the disk, the data including an encrypted password, the password being located at an arbitary location within the data, reading the data resulting in an error signal, locating an indexing position and applying an offset to identify the password, and unencrypting and authenticating the password in order to execute the disk.

REFERENCES:
patent: 4462078 (1984-07-01), Ross
patent: 4577289 (1986-03-01), Comerford et al.
patent: 4584641 (1986-04-01), Guglielmino
patent: 4734796 (1988-03-01), Grynberg
patent: 4785361 (1988-11-01), Brathy
patent: 4849836 (1989-07-01), Kachikian
Voelcker et al., `How Disks Are Padlocked`, IEEE Spectrum, V23, N6, 6/86, pp. 32-40.

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