Tamper-resistant method for authorizing access to data between a

Details Tamper-resistant method for authorizing access to data between a Tamper-resistant method for authorizing access to data between a

1989-02-24

1990-07-10

Tarcza, Thomas H.

Cryptography

Cryptanalysis

380 3, 380 23, 364969, 3642865, H04L 900

Patent

active

049411756

ABSTRACT:
A tamper-resistant method is disclosed for controlling the number of users given authorized access to licensed software in a host-based, multiple terminal system by use of an encrypted authorization list depth parameter. The method embedded in the host-licensed software can decrypt the depth parameter only using a key derived from its own CPU ID and an offset.

REFERENCES:
patent: 4218738 (1980-08-01), Matyas et al.
patent: 4408274 (1983-10-01), Wheatley et al.
patent: 4545016 (1985-10-01), Berger
patent: 4713753 (1987-12-01), Boebert et al.
patent: 4757533 (1988-07-01), Allen et al.
patent: 4791565 (1988-12-01), Dunham et al.

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