An efficient fully dynamic group signature with message dependent opening from lattice

Cybersecurity

article

Sun, Yiru¹  Liu, Yanyan¹ 

[1] State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences;School of Cyber Security, University of Chinese Academy of Sciences;State Key Laboratory of Cryptology

关键词: Dynamic group signature;    Message-dependent opening;    NIZK;    LWE;    SIS;   

DOI  :  10.1186/s42400-021-00076-8

学科分类：社会科学、人文和艺术（综合）

来源: Springer

【 摘 要 】

Message-dependent opening is one of the solutions to solve the problem of the tracing manager owns excessive power. In this paper, we present a new lattice-based fully dynamic group signature scheme with message-dependent opening by combining an improved version of the fully dynamic group signature scheme proposed by Ling et al and the double encryption paradigm. In addition, we propose an improved underlying zero knowledge protocol, it has a soundness error $\frac {1}{\max (n,p)+1}$ that is better than the Stern-like protocol, which helps to bring down the communication complexity of the protocol and hence the signature scheme. Our scheme constrains the power of group managers by adding an admitter, and the signature size has a logarithmic relationship with the group size.

【 授权许可】

CC BY