The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2011
Filed:
Oct. 05, 2005
Masaru Fuse, Osaka, JP;
Satoshi Furusawa, Osaka, JP;
Tsuyoshi Ikushima, Nara, JP;
Toru Shiozaki, Kyoto, JP;
Masaru Fuse, Osaka, JP;
Satoshi Furusawa, Osaka, JP;
Tsuyoshi Ikushima, Nara, JP;
Toru Shiozaki, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
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 () to a data receiving apparatus () via a transmission path (). In the data transmitting apparatus (), a multilevel encoding part () 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 () superimposes a dummy signal on the multilevel signal. A modulating part () converts the multilevel signal to a modulated signal of a predetermined modulation form and transmits the modulated signal. The data receiving apparatus () 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.