Cryptographic system

Details Cryptographic system Cryptographic system

1986-06-23

1987-05-05

Cangialosi, Salvatore

Cryptography

Key management

Having particular key generator

380 48, 380 50, H04L 900

Patent

active

046635009

ABSTRACT:
A cryptographic system comprises a modulo-2 adder having a first input receptive of a sequence of binary digits to be scrambled and a second input receptive of a sequence of scrambling binary digits for generating a sequence of scrambled binary digits. A function generator having a memory is provided for storing a predeterminable sequence of binary digits in addressible storage locations and reading the stored binary digits in response to an address code represented by combined first and second patterns of binary digits which are generated respectively by a random pattern generator and a shift register which is connected to the output of the modulo-2 adder. The output of the function generator is the scrambling binary digits applied to the modulo-2 adder.

REFERENCES:
patent: 4434322 (1984-02-01), Ferrell
patent: 4447672 (1984-05-01), Nakamura
IBM Technical Disclosure Bulletin, "Block Chaining Using Plaintext-Ciphertext Feedback" by Ehrsam et al., vol. 22, #2 7/79.

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