Invention Grant
- Patent Title: Data conversion apparatus and data conversion method
- Patent Title (中): 数据转换装置和数据转换方法
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Application No.: US11884314Application Date: 2005-03-16
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Publication No.: US07949807B2Publication Date: 2011-05-24
- Inventor: Tsuneo Sato , Keiki Yamada
- Applicant: Tsuneo Sato , Keiki Yamada
- Applicant Address: JP Tokyo
- Assignee: Mitsubishi Electric Corporation
- Current Assignee: Mitsubishi Electric Corporation
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP.
- International Application: PCT/JP2005/004637 WO 20050316
- International Announcement: WO2006/098015 WO 20060921
- Main IPC: G06F13/12
- IPC: G06F13/12

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 register 105 of 32 bits and the key is kept in a key shift register 106 of 32 bits. Then, 1 bit of the input data and 1 bit of the key are input into a serial operator 107, and an exclusive OR of 1 bit is obtained and shifted to the left end of the input shift register 105. The key shift register 106 performs 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 105.
Public/Granted literature
- US20080276106A1 Data Conversion Apparatus and Data Conversion Method Public/Granted day:2008-11-06
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