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:
May. 04, 2004
Filed:
Aug. 27, 1999
Toru Ito, Yokohama, JP;
Netcomsec Co., Ltd., Tokyo, JP;
Abstract
The secrecy security of coded data can be improved markedly by making it possible to freely vary, within a plurality of natural numbers, the values as the result of coding and decoding operations by a converter using a feedback coding method. As a digital information secrecy security system, the proposed coding method employs a feedback coding method, wherein a Latin square composed of a plurality of natural numbers is used for operation in a converter component of coder and decoder. An initial value IV is set for each of coder and decoder. A preceding coded signal is used as a feedback signal and a feedforward signal for enabling natural numbers to be used as the result of coding, thereby markedly improving the secrecy security of coded signal.