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. 24, 2011
Filed:
Mar. 16, 2005
Tsuneo Sato, Tokyo, JP;
Keiki Yamada, Tokyo, JP;
Tsuneo Sato, Tokyo, JP;
Keiki Yamada, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
It is aimed, for example, to reduce an amount of power consumption of an operation concerning data encryption or decryption and to make it difficult to perform a power analysis. In the case an exclusive OR operation between 32-bit input data and a 32-bit key is performed to obtain output data of 32 bits, the input data is kept in an input shift registerof 32 bits and the key is kept in a key shift registerof 32 bits. Then, 1 bit of the input data and 1 bit of the key are input into a serial operator, and an exclusive OR of 1 bit is obtained and shifted to the left end of the input shift register. The key shift registerperforms a cyclic right shift. By performing the above thirty-two times, the operation of 32 bits is completed and the last result is kept in the input shift register