DES Parity check system

Details DES Parity check system DES Parity check system

1979-06-28

1981-04-14

Malzahn, David H.

Excavating

G06F 1110

Patent

active

042623588

ABSTRACT:
A system for providing on-line parity checking in data encryption/decryption systems such as DES and which is especially useful where multiple stage shifting is accomplished on a single clock input to the algorithm shift register of such a system. The parity system provides for simultaneous parity checks on a plurality of bytes where the bits of each byte are distributed through the algorithm shift register in a pseudorandom pattern.

REFERENCES:
patent: 3466602 (1969-09-01), Moser et al.
patent: 3602886 (1971-08-01), Carter et al.
patent: 4035766 (1977-07-01), Barker
patent: 4088876 (1978-05-01), Rege

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