Patent ID: 7986783
Filing Date: 2011-07-26
Classification: H04L

Abstract:
1. A data transmitting apparatus for encrypting information data by using previously shared key information and performing secret communication with a receiving apparatus, the data transmitting apparatus comprising: a multi-level code generation section for generating, based on the key information, a multi-level code sequence in which a signal level changes so as to be random numbers; an error signal generation section for generating an error signal having a value which changes at a same bit rate as the information data; an accumulation section for accumulating the error signal and outputting an accumulated error signal; and a variable multi-level modulator section for generating, based on the information data, the multi-level code sequence and the accumulated error signal, a variable multi-level signal which corresponds to a combination between the information data and the multi-level code sequence and which has a level which changes based on the accumulated error signal, for modulating, in a predetermined modulation method, the variable multi-level signal having been generated, and for outputting a modulated signal.