Method and apparatus for combined encryption and scrambling of i

Details Method and apparatus for combined encryption and scrambling of i Method and apparatus for combined encryption and scrambling of i

1993-11-05

1995-12-05

Gregory, Bernarr E.

Cryptography

Key management

Having particular key generator

380 9, 380 46, H04L 900

Patent

active

054736960

ABSTRACT:
An improved method and apparatus for encrypting and scrambling information cells transmitted on a telephone system local loop from a central office to a plurality of user premises networks via a shared medium passive optical network. Prior to transmission, the information cell is encrypted for security purposes and scrambled to improve its transmission properties by modulo 2 addition of the information cell and a combined encryption and scrambling sum pattern. At the other end of the passive optical network which is connected to user premises networks, the received encrypted and scrambled information cells are used to generate a processed cell by the modulo 2 addition of the received cell and a combined decryption and descramble sum pattern.

REFERENCES:
J. Svigals, "Dynamic Communication Key Accumulated from Previous Message Content"; IBM Tech. Discl. Bull., (vol. 25, No. 1, Jun. 1982; p. 279).
H. H. Grotjohann, F. Jaegar and P. G. Schaafsma, Dutch FTTH on Trial, Communications International, pp. 49-56 (Jan. 1992).
CCITT Recommendation I. 361, B-ISDN ATM Layer Specification, Study Group XVIII, Report R-116, .sctn.2, pp. 2-16 (Jul. 1992).
CCITT Recommendation I. 432, B-ISDN User Network Interface--Physical Layer Specification, Study Group XVIII, Report R-119, .sctn..sctn. 4.3, 4.5 pp. 157-199 (1992).

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