Data transfer method, communication system and storage medium

Details Data transfer method, communication system and storage medium Data transfer method, communication system and storage medium

1997-01-30

2000-03-14

Gregory, Bernarr E.

Cryptography

Communication system using cryptography

Pseudo-random sequence scrambling

380200, 380210, 380255, 380287, 713189, 713200, 713201, H04L 900

Patent

active

060383216

ABSTRACT:
In a communication system, a transmitter device encrypts variable-length data having a data length corresponding to a kind of information to be transferred or a communication capacity, using a natural random number, to produce a variable-length random number sequence. Then, the transmitter device performs an exclusive OR operation per bit between the variable-length random number sequence and the information to produce transfer information, and transmits the transfer information to a receiver device. The transmitter device further transmits the variable-length data and the natural random number in an encrypted manner to the receiver device. The receiver device reproduces the variable-length data and the natural random number transmitted in the encrypted manner, and then encrypts the variable-length data using the natural random number to produce a variable-length random number sequence which is identical with the foregoing variable-length random number sequence produced at the transmitter device. Then, the receiver device performs an exclusive OR operation per bit between the thus produced variable-length random number sequence and the received transfer information to reproduce the original information.

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