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:
Jan. 12, 2016
Filed:
Jul. 25, 2011
Yoichi Shibata, Tokyo, JP;
Yoichi Shibata, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An encryption device that, when voice or image data or the like being encoded is encrypted using a one-time pad (OTP) cipher and then transmitted, reduces a period of time in which a cipher key for the OTP cipher runs out. A first terminal device determines whether to encode transmission data by a first encoding scheme or a second encoding scheme having a lower bit rate than the first encoding scheme, depending on the number of remaining bits of an OTP cipher key, and encodes the transmission data according to the determined encoding scheme, thereby generating encoded data. The first terminal device encrypts the generated encoded data with the OTP cipher using the OTP cipher key, thereby generating encrypted communication data, and transmits the generated encrypted communication data to a second terminal device.