04819267 is referenced by 108 patents and cites 13 patents.

A semiconductor device that functions as a key to control access to a computer or a software program resident in a computer or provides for secure communications is disclosed. The device executes an algorithm that combines a root and a seed to produce a password. The password is input to the computer. The computer uses an equivalent algorithm to produce a password within the computer. Comparison or other methods are employed to allow access to the computer or computer program or to allow for secure communications. The computer can be coded to produce on a video display thereof a time-space stimulus pattern which can be received by sensors of the key. Alternatively, a keypad can be employed to input the stimulus output from the computer into the access key. Further the present system allows for secure communication using algorithms between different computers and between distant locations.

Title
Solid state key for controlling access to computer systems and to computer software and/or for secure communications
Application Number
582302
Publication Number
4819267
Application Date
June 9, 1987
Publication Date
April 4, 1989
Inventor
James M Lyon
San Jose
CA, US
Richard D Freeman
Sunnyvale
CA, US
William P Cargile
Half Moon Bay
CA, US
Agent
Fliesler Dubb Meyer & Lovejoy
Assignee
Thumbscan
IL, US
IPC
H04L 9/04
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