AccCred: Improved accountable anonymous credentials with dynamic triple-hiding committees

Publication Type

Journal Article

Publication Date

5-2025

Abstract

Accountable anonymous credentials protect user privacy while holding the accountability of ill-intentioned individuals, which is a critical feature for applications such as online payments and other financial services. Existing accountable anonymous credentials rely on a public committee of trustworthy members who are assumed not to collude and are well protected to perform privacy revocation. However, this assumption is unsound in blockchain-based cryptocurrency systems because the selected committees may involve nodes with significant stakes, and public nodes serving as committee members are vulnerable against targeted attacks from high-computing power adversaries. In this paper, we propose an improved accountable anonymous credential called AccCred, allowing users and issuers to randomly select a hidden committee within a set of authenticated candidates for privacy revocation. No one except the members with corresponding private keys knows their identity, preventing proactive attacks. As a core component, we introduce the primitive of dynamic triple-hiding committees (DTHC), which achieves authentication, dynamic join/delete, random selection, and strong anonymity of committee members. As a building block of DTHC, we design a shuffle protocol to provide efficient shuffle proof of randomized public keys. We formally prove our scheme and compare its performance with previous work for demonstration of practicality.

Keywords

Full shuffle, hidden committees, privacy revocation, privacy-preserving, anonymous credentials

Discipline

Information Security

Research Areas

Information Systems and Management

Publication

IEEE Transactions on Dependable and Secure Computing

Volume

22

Issue

3

First Page

1961

Last Page

1975

ISSN

1545-5971

Identifier

10.1109/TDSC.2024.3474060

Publisher

Institute of Electrical and Electronics Engineers

Additional URL

https://doi.org/10.1109/TDSC.2024.3474060

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