A Signature Protocol Based on Specific Set

2014 ◽  
Vol 696 ◽  
pp. 233-236
Author(s):  
Zhi Hao Wang ◽  
Hao Guo
Keyword(s):  
Group Signature ◽  
Joint Involvement ◽  
Signature Scheme ◽  
Threshold Signature ◽  
Threshold Group Signature

Based on the idea of privilege set, this paper proposes a threshold group signature scheme with multiple privilege sets. Only when the joint involvement of ordinary users under satisfied conditions and privileged users with multiple privilege sets can the valid proxy group signature be generated. Some members can’s forge signatures, which can help resist attacks. The threshold signature scheme has good features of privilege sets and threshold characteristics, unforgeability of signature and anonymity of verification and traceability of identity.

A (t, n) Threshold Signature Scheme Based on Factorial Decompose Theorem of Polynomial

2011 ◽  
Vol 50-51 ◽  
pp. 49-53
Author(s):  
Yong Quan Cai ◽  
Fu Lai Cheng
Keyword(s):  
Secret Sharing ◽  
Threshold Value ◽  
Group Signature ◽  
Secret Sharing Scheme ◽  
Signature Scheme ◽  
Threshold Signature ◽  
Collusion Attack ◽  
Sharing Scheme ◽  
Current Threshold ◽  
Digital Signature Scheme

The traditional threshold signature scheme is a combination of the digital signature scheme and the secret sharing scheme. Any group of t (threshold value) or more players can reconstruct the secret together but no group of fewer than t players can in secret sharing scheme. Because of this property of secret sharing scheme, the current threshold signature scheme has a natural weakness in the anti-collusion attack. A new threshold signature scheme based on the factorial decompose theorem is designed successfully without the secret sharing scheme in order to get the ability of anti-collusion attacks. It not only has the property of group signature and threshold signature, but also has some good features including traceability，robustness and resisting forgery attacks.

scholarly journals A Threshold Signature Scheme Without Trusted Center for Blockchain-Based Medical Cyber-Physical Systems

2021 ◽  
Author(s):  
Xianfei Zhou ◽  
Jing Huang ◽  
Fulong Chen ◽  
Yuqing Tang ◽  
Canlin Wang ◽  
...  
Keyword(s):  
Data Sharing ◽  
Data Storage ◽  
Medical Information ◽  
Rapid Development ◽  
Medical Data ◽  
Group Signature ◽  
Signature Scheme ◽  
Threshold Signature ◽  
Shared Data ◽  
Rapid Transformation

Abstract With the rapid development of medical information technology, the medical cyber-physical system is undergoing a rapid transformation, and the safe storage and sharing of medical data are facing great challenges. It makes the work of safe medical data storage, privacy protection and data sharing get more difficult. In this paper, we propose the combination of private blockchain and consortium blockchain that can protect information security and realize data sharing. In the system, the medical records of each node are stored in the private blockchain, and the shared data is on the consortium blockchain so as to improve the data storage and reduce data redundancy. And the threshold signature scheme without trusted center is applied in the system. In order to initiate threshold signature, a set of nodes is constructed by the sponsoring doctor, in which the threshold signature process is initiated. When there are no less than $t$ nodes sending part-signatures, the signature can be synthesized to group signature. This scheme can be well applied to the scene of multidisciplinary joint consultation in the medical blockchain. The scheme proposed in this paper has high security and computing efficiency.

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