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:
Sep. 08, 2009
Filed:
Oct. 24, 2002
Keiki Yamada, Tokyo, JP;
Tsuneo Sato, Tokyo, JP;
Keiki Yamada, Tokyo, JP;
Tsuneo Sato, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
This invention relates to an encryption communication apparatus using encryption processing. It is an object of this invention to obtain the encryption communication apparatus with excellent tamper-resistance while ensuring sufficient securities. A communicating unitsends and receives communication data including a length field and a data field. A length comparing unitcompares a value of the length field and a minimum length value stored in the apparatus in advance. When it is judged that the value of the length field is less than the minimum length value, a controlling unitcontrols an encryption processing unitnot to perform encryption processing or decryption processing of the data in the data field.