Telegraphy – Systems – Printing
Patent
1975-02-28
1977-01-18
Birmiel, Howard A.
Telegraphy
Systems
Printing
340149A, H04L 900
Patent
active
040040895
ABSTRACT:
An encrypter for encoding and decoding data, wherein clear text data to be encoded is logically combined with a portion of a non-linear pseudo-random bit sequence signal to provide a partially encoded signal. The bit sequence of the non-linear pseudo-random signal is chosen in accordance with a user selected key. A shuffle register receives the partially encoded signal and interchanges the positions of the bits making up the partially encoded signal in accordance with a user selected key to provide the fully encoded signal. The fully encoded signal may then be recorded, for example, on the magnetic stripe of a credit card.
Means are provided for decoding the above described encoded signal using the same portion of the nonlinear pseudo-random bit sequence that was used for encoding.
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patent: 3657699 (1972-04-01), Rocher et al.
patent: 3731197 (1973-05-01), Clark
patent: 3773977 (1973-11-01), Guanella
patent: 3781473 (1973-12-01), Goode et al.
patent: 3798359 (1974-03-01), Feistel
patent: 3798360 (1974-03-01), Feistel
patent: 3824467 (1974-07-01), French
patent: 3911216 (1975-10-01), Bartek et al.
Grillmeier Eugene L.
Gross Jack R.
Myers Robert P.
Richard Harold S.
Birmiel Howard A.
Cavender J. T.
Dugas Edward
NCR Corporation
Sessler Jr. Albert L.
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