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:
Jun. 10, 2008
Filed:
Oct. 08, 2003
Iwao Oofuji, Kanagawa, JP;
Tsutomu Ichinose, Tochigi, JP;
Iwao Oofuji, Kanagawa, JP;
Tsutomu Ichinose, Tochigi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A block cipher method eliminates the overhead associated with key scheduling, decreases the required time for encryption or decryption, and increases the total throughput. A key scheduling circuit () for generating round key data from key data for the encryption or the decryption and a bank memory () for storing the round key data generated by the key scheduling circuit () at a predetermined bank of the bank memory are provided. An encrypting/decrypting circuit () is provided for encrypting plaintext data or decrypting ciphertext data upon receipt of the round key data stored in the bank and a block of the plaintext data or the ciphertext data one by one. The output of the encryption or the decryption is retrieved from the encrypting/decrypting circuit ().