Digital data processor having data-unscrambling function

Cryptography – Electric signal modification – Having production of printed copy

Patent

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Details

380 4, 3642558, 3649556, H04L 902

Patent

active

050460951

ABSTRACT:
A data processor includes a data unscrambling unit. The unit includes a memory circuit for storing data supplied thereto in a scrambled form, the data stored in the memory circuit being thereafter read out therefrom in an order which is to be the unscrambled form. The memory circuit includes a memory cell array, a set of first terminals supplied with a write address having a value which is changed one by one, a data write control circuit for writing data into the memory cell array in a first order in accordance with changes in value of the write address. A set of second terminals is supplied with a read address having a value which is changed one by one. A data read control circuit reads out data from the memory cell array in a second order that is different from the first order, the read out being in accordance with a change in value of the read address.

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patent: 4465901 (1984-08-01), Best
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patent: 4771462 (1988-09-01), Hannan et al.
patent: 4797928 (1989-01-01), Dykes
patent: 4837821 (1989-06-01), Kage

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