Anonymous Authentications for Privacy-Enhancing Crowd Sensing

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K11964
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 60070:Information security-related
• Research Institution: Hiroshima University
• Principal Investigator: Nakanishi Toru 広島大学, 先進理工系科学研究科(工), 教授 (50304332)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: プライバシー / 匿名認証 / 群衆センシング

Outline of Final Research Achievements

Crowd sensing using lots of users' mobile devices has been studied extensively because of its ease of implementation and use. However, it may cause a privacy problem, since users send their location information along with their IDs. Thus, anonymous authentication without user ID has been proposed. In addition, since the trustworthiness of anonymized users cannot be determined, a method to measure the trustworthiness of anonymous users and data has been proposed. However, conventional methods have problems in anonymity. In this research, we construct methods with improved anonymity, and examine the security. In addition, we implement prototypes of each algorithm and conduct experiments in an environment that assumes crowd sensing to demonstrate their usefulness.

Free Research Field

情報セキュリティ

Academic Significance and Societal Importance of the Research Achievements

本研究により，従来の匿名認証方式におけるユーザ失効方法や匿名評判システムでは十分に達成されていなかったユーザのプライバシー（匿名性）と実用的な効率を達成している．さらに，方式提案だけではなく，理論的な定式化と証明による安全性保証に加えて，実際の群衆センシング環境における実用性評価も行っており，理論的な安全性と実用的な効率を両立した群衆センシングにおけるプライバシー保護を達成していると考える．