Invention Grant
US08090957B2 Information security device, information security method, computer program, computer-readable recording medium, and integrated circuit
有权
信息安全装置，信息安全方法，计算机程序，计算机可读记录介质和集成电路
- Patent Title: Information security device, information security method, computer program, computer-readable recording medium, and integrated circuit
- Patent Title (中): 信息安全装置，信息安全方法，计算机程序，计算机可读记录介质和集成电路
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Application No.: US12088028Application Date: 2006-10-18
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Publication No.: US08090957B2Publication Date: 2012-01-03
- Inventor: Natsume Matsuzaki , Yuichi Futa
- Applicant: Natsume Matsuzaki , Yuichi Futa
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- Priority: JP2005-304169 20051019
- International Application: PCT/JP2006/320715 WO 20061018
- International Announcement: WO2007/046402 WO 20070426
- Main IPC: H04L29/06
- IPC: H04L29/06
Abstract:
The present invention aims to provide an information security apparatus that counters a simple power analysis attack (SPA) on an information security apparatus such as an RSA cryptosystem. The information security apparatus uses a multiplication with 1 in a Montgomery domain. 1 in the Montgomery domain is determined depending on a modulus and an integer k, which is greater than a number of bits of a modulus p. Therefore, it is hard for attackers who do not know p or k to analyze. Also, even if an analyzer can predict the Hamming weight, it is possible to further improve the safety against the SPA by modifying k or the modulus at random.
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