Method and apparatus for data encryption or decryption

Details Method and apparatus for data encryption or decryption Method and apparatus for data encryption or decryption

1991-09-30

1993-03-16

Cangialosi, Salvatore

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

380 46, 380 50, H04K 102

Patent

active

051951363

ABSTRACT:
A cryptographic apparatus comprises a linear feedback shift register for providing a pseudo-random code, coupled to a ciphering device, which is in turn coupled to an adder. The ciphering device encrypts the pseudo-random code. One adder circuit input is coupled to a ciphering device, and the other adder circuit input is coupled to the data input. The adder circuit adds data input signals to ciphering device signals to provide output signals. A method for operation of a ciphering engine is described comprising the steps of providing a random number and setting tap weights for a linear feedback shift register, obtaining a pseudo-random bit stream therefrom, and then encrypting the pseudo-random bit stream to generating a traffic key stream. The traffic key stream is added to a data stream to produce encrypted data from plain-text data or, alternatively, the traffic key stream is added to an encrypted data stream to produce plain-text data.

REFERENCES:
patent: Re33189 (1990-03-01), Lee et al.
patent: 4202051 (1980-05-01), Davida et al.
patent: 4608455 (1986-08-01), McNair
patent: 4663500 (1987-05-01), Okamoto et al.
patent: 4685132 (1987-08-01), Bishop et al.
patent: 4802217 (1989-01-01), Michener
patent: 4815130 (1989-03-01), Lee et al.
patent: 4890324 (1989-12-01), Jansen
patent: 4897876 (1990-01-01), Davies
patent: 4984247 (1991-01-01), Kaufmann et al.
patent: 5060265 (1991-10-01), Finkelstein
patent: 5086467 (1992-02-01), Malek
patent: 5105376 (1992-04-01), Pedron

Affiliated with

Also associated with

Rating

Method and apparatus for data encryption or decryption does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for data encryption or decryption, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for data encryption or decryption will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-356650