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. 05, 2009
Filed:
Sep. 25, 2003
Applicants:
Tsutomu Ichinose, Tochigi, JP;
Iwao Oofuji, Kanagawa, JP;
Nobutane Hideshima, Kanagawa, JP;
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/00 (2006.01); G06F 12/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A variable-length block encryption circuit having a simplified structure and that reduces the load on a host computer. A plaintext memory and an encryption/decryption circuit for encrypting or decrypting original data in blocks. The original data is transferred to the plaintext memory from the exterior. The transferred original data is supplied to the encryption/decryption circuit and is subjected to encryption or decryption in blocks. The result data is substituted for the original data in the plaintext memory. When all transferred original data is substituted, the result data is externally output.