Encryption apparatus

Details Encryption apparatus Encryption apparatus

1990-03-09

1991-04-16

Tarcza, Thomas H.

Cryptography

Electric signal modification

Having production of printed copy

380 43, H04L 900

Patent

active

050089382

ABSTRACT:
An encryption circuit that operates with substantially zero delay. Using programmable keys and polynomials, the encryption algorithm can be constantly changed to thwart any unintended receiving parties from decoding the data. A key (101) and a polynomial (102) are loaded into registers. The key is then loaded into a shift register and shifted through XOR gates (106) at a programmable rate. The other input of the XOR gates come from the result of ANDing (103) a disable signal, the polynomial register (102), and the last stage of the shift register (104). Eight bits of the shift register outputs are XOR'ed with the input data to be encrypted. The output of these XOR gates (105) is the encrypted data.

REFERENCES:
patent: 4598170 (1986-07-01), Piosenka et al.
patent: 4694492 (1987-09-01), Wirstrom et al.
patent: 4751733 (1988-06-01), Delayaye et al.
patent: 4860353 (1989-08-01), Brown
patent: 4899383 (1990-02-01), Einolf, Jr. et al.

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