Data communication system

Details Data communication system Data communication system

2011-03-15

2011-03-15

Smithers, Matthew B (Department: 2437)

Cryptography

Communication system using cryptography

Fiber optic network

C455S108000, C332S149000

Reexamination Certificate

active

07907731

ABSTRACT:
A data communication system that enhances concealment by significantly increasing the time required for a wiretapper to decrypt a cipher text. The data communication system is constituted by connecting a data transmitting apparatus (13105) to a data receiving apparatus (11201) via a transmission path (110). In the data transmitting apparatus (13105), a multilevel encoding part (111) receives a predetermined first initial value (key information) and information data and generates a multilevel signal that varies in level substantially in a random number manner. A dummy signal superimposing part (118) superimposes a dummy signal on the multilevel signal. A modulating part (112) converts the multilevel signal to a modulated signal of a predetermined modulation form and transmits the modulated signal. The data receiving apparatus (11201) demodulates the modulated signal to output the multilevel signal, and receives a predetermined second initial value (key information) and the multilevel signal to reproduce the information data.

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