Telegraphy – Systems – Printing
Patent
1984-02-22
1986-07-08
Shaw, Gareth D.
Telegraphy
Systems
Printing
G06K 500
Patent
active
045994897
ABSTRACT:
A semiconductor device that functions as a key to control access to a software program resident in a computer. The device includes a continuously running pulse generator that produces an output representative of real time, a shift register permanently storing a unique number and circuitry for executing an algorithm that combines real time and the permanently stored unique number to produce a password. The password is input to the computer. The computer is coded to execute an equivalent algorithm to produce a password within the computer. The two passwords are compared and access to the computer program is afforded only if they bear a prescribed relationship. The computer can be coded to produce on the video display thereof a time-space pattern on the computer video display, circuitry for deriving the stimulus number therefrom, and circuitry for processing the stimulus number so that the password displayed by the key is a function of the value of the stimulus number. The computer executes a similar procedure on the stimulus number so that access to the software program is afforded only if correspondence exists between the user input password and the password generated in the computer.
REFERENCES:
patent: 3457391 (1969-07-01), Yamamoto
patent: 3761683 (1973-09-01), Rogers
patent: 3786420 (1974-01-01), Stambler
patent: 3794813 (1974-02-01), Spetz
patent: 3806874 (1974-04-01), Ehrat
patent: 3891799 (1975-06-01), Melhose
patent: 3938091 (1976-02-01), Atalla
patent: 4198619 (1980-04-01), Atalla
patent: 4268715 (1981-05-01), Atalla
patent: 4281215 (1981-07-01), Atalla
patent: 4283599 (1981-08-01), Atalla
patent: 4288659 (1981-09-01), Atalla
patent: 4295039 (1981-10-01), Stuckert
patent: 4304990 (1981-12-01), Atalla
patent: 4310720 (1982-01-01), Check, Jr.
patent: 4315101 (1982-02-01), Atalla
patent: 4328414 (1982-05-01), Atalla
patent: 4357529 (1982-11-01), Atalla
patent: 4447890 (1984-05-01), Duwel et al.
patent: 4494114 (1985-01-01), Kaish
Gordian Systems, Inc.
Mills John G.
Shaw Gareth D.
LandOfFree
Solid state key for controlling access to computer software does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solid state key for controlling access to computer software, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid state key for controlling access to computer software will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1452563