Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Using particular code or particular counting sequence
Patent
1979-12-07
1983-11-29
Thesz, Joseph M.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Using particular code or particular counting sequence
364200, 178 2214, 377 44, H03K 2130
Patent
active
044182759
ABSTRACT:
Hashing of a key data signal is accomplished by utilizing a pseudo random number signal generator for generating a randomized signal in response to the key data signals and an output register for serially receiving the generated pseudo-random signal and for providing segments of the serially-received signal at its output. A counting circuit responsive to a preselected number of shift signals provides an output valid signal when the preselected number of shift signals has occurred and further shifts the pseudo-random number signal generator an amount corresponding to the preselected number of shift signals. The method of the present invention utilizes the steps of presetting the pseudo-random number generator and the counting circuit to an initialized state. The counting circuit is then loaded with a predetermined count whereupon key data is entered into the pseudo-random number generator so as to randomize the key data. A valid signal is provided when a block of key data has been hashed and the steps of entering the key data and providing a valid signal upon the occurrence of each block of key data is repeated until all key data blocks have been hashed.
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D. E. Knuth, "The Art of Computer Programming", vol. 3, pp. 506-549, 1973.
Oosterbaan DuWayne D.
Williams Gerard J.
Cavender J. T.
Dugas Edward
Gillette Donald P.
NCR Corporation
Thesz Joseph M.
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