Cryptography – Cryptanalysis
Patent
1991-10-17
1993-06-22
Cain, David
Cryptography
Cryptanalysis
H04L 900
Patent
active
052221334
ABSTRACT:
A method of protecting computer software is provided by storing a first key in a plug-in hardware device, storing an algorithm for processing a purality of keys including the first key in software to be protected, loading the software containing the algorithm in the computer and plugging in a hardware device in a communications port of the computer. A second key, external to the software, to be protected which bears a relationship to the first key by the algorithm is loaded into the computer where processing takes place of the first and second keys in the algorithm for deriving a control key, if present, for the continued processing of the software being protected. The step of loading the second key is performed using a computer keyboard, any input/output port, a hard disk file or any other method of entry in the computer. Additional keys external to the software which bear a relationship to the first and second keys configured in the algorithm may be provided.
REFERENCES:
patent: 4599489 (1986-07-01), Cargile
patent: 4609777 (1986-09-01), Cargile
patent: 4817140 (1989-03-01), Chandra et al.
patent: 4866769 (1989-09-01), Karp
patent: 4959861 (1990-09-01), Howlette
patent: 5033084 (1991-07-01), Beecher
patent: 5081676 (1992-01-01), Chou et al.
patent: 5083309 (1992-01-01), Beysson
Chou Wayne W.
Erett Richard
Kulinets Joseph M.
Cain David
Chou Wayne W.
Erett Richard
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