Data transmitting apparatus

Details Data transmitting apparatus Data transmitting apparatus

2011-07-26

2011-07-26

Lanier, Benjamin E (Department: 2432)

Cryptography

Video cryptography

Video electric signal modification

C375S286000, C380S030000, C380S239000, C398S183000

Reexamination Certificate

active

07986783

ABSTRACT:
A data transmitting apparatus has improved security against eavesdropping for secret communication using Y-00 protocol. The multi-level code generation section generates, based on key information, a multi-level code sequence in which a signal level changes so as to be approximately random numbers. The multi-level processing section generates a multi-level signal having a level which corresponds to a combination between information data and the multi-level code sequence. The error signal generation section generates an error signal which changes randomly. The accumulation section accumulates the error signal, and outputs an accumulated error signal. The adding section adds the accumulated error signal to the multi-level signal, and outputs a variable multi-level signal. The modulator section modulates the variable multi-level signal, and outputs a modulated signal.

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