Signature Schemes with a Fuzzy Private Key

In this paper, we introduce a new concept of digital signature that we call \emph{fuzzy signature}, which is a signature scheme that uses a noisy string such as biometric data as a private key, but \emph{does not require user-specific auxiliary data} (which is also called a helper string in the context of fuzzy extractors), for generating a signature. Our technical contributions are three-fold: (1) We first give the formal definition of fuzzy signature, together with a formal definition of a \lq\lq setting\u27\u27 that specifies some necessary information for fuzzy data. (2) We give a generic construction of a fuzzy signature scheme based on a signature scheme that has certain homomorphic properties regarding keys and satisfies a kind of related key attack security with respect to addition, and a new tool that we call \emph{linear sketch}. (3) We specify two concrete settings for fuzzy data, and for each of the settings give a concrete instantiation of these building blocks for our generic construction, leading to two concrete fuzzy signature schemes. We also discuss how fuzzy signature schemes can be used to realize a biometric-based PKI that uses biometric data itself as a cryptographic key, which we call the \emph{public biometric infrastructure (PBI)}

A User Authentication Based on Personal History : A User Authentication System Using E-mail History

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Gamified CAPTCHA

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Social Innovation Based on the Business Process Perspective: A Case Study of an Unattended Movable Store

Since it is believed that the creation of social innovation is the key to success in social business, numerous studies have focused on the influences of collaborations with other organizations and entrepreneurship on such creation. However, since these discussions only included people-related aspects, the determinants have yet to be clarified. Therefore, this study proposes that social innovation is created by a change in the business process and elucidates the determinants of social innovation. By applying Davenport’s (1992) process innovation model, it examines the case of an unattended movable store that uses information and communication technology to create a social business. In addition, using the Design and Engineering Methodology for Organizations model, this study performs a comparison of the unattended movable store and a staffed general store in Japan. Additional data are collected through a series of interviews with key figures in the case. The results show that social innovation is created by a change in the business process and that the determinants of such innovation consist of four factors: 1) executor shift, 2) automation, 3) data sharing, and 4) acquisition of outside resources

Directcha : A proposal of spatiometric mental rotation CAPTCHA

2016 14th Annual Conference on Privacy, Security and Trust (PST)Date of Conference: 12-14 December 2016Conference Location: Auckland, New Zealandautho

Improving Classification Accuracy by Optimizing Activation Function for Convolutional Neural Network on Homomorphic Encryption

The 17th International Conference on Broad-Band Wireless Computing, Communication and Applications (BWCCA-2022)October 27-29Polytechnic University of Tirana, Tirana, Albaniaautho

Trust Management IV: 4th IFIPWG11.11 International Conference, IFIPTM 2010 Morioka, Japan, June 16-18, 2010, Proceedings

International audienceBook Front Matter of AICT 32