@Article{cmc.2020.010562,
AUTHOR = {Ning Liu, Fan Yang, Xi Xiong, Yan Chang, Shibin Zhang},
TITLE = {A Trust Value Sharing Scheme in Heterogeneous Identity  Federation Topologies},
JOURNAL = {Computers, Materials \& Continua},
VOLUME = {65},
YEAR = {2020},
NUMBER = {2},
PAGES = {1559--1570},
URL = {http://www.techscience.com/cmc/v65n2/39893},
ISSN = {1546-2226},
ABSTRACT = {Recent developments in heterogeneous identity federation systems have 
heightened the need for the related trust management system. The trust management 
system evaluates, manages, and shares users’ trust values. The service provider (SP)
members of the federation system rely on users’ trust values to determine which type and 
quality of service will be provided to the users. While identity federation systems have
the potential to help federated users save time and energy and improve service experience, 
the benefits also come with significant privacy risks. So far, there has been little 
discussion about the privacy protection of users in heterogeneous identity federation
systems. In this paper, we propose a trust value sharing scheme based on a proxy ring 
signature for the trust management system in heterogeneous identity federation 
topologies. The ring signature schemes can ensure the validity of the data and hide the 
original signer, thereby protecting privacy. Moreover, no group manager participating in 
the ring signature, which naturally matches with our decentralized heterogeneous identity 
federation topologies. The proxy signature can reduce the workload of the private key 
owner. The proposed scheme shortens the calculation time for verifying the signature and 
then reduces the overall time consumption in the process of trust sharing. Our studies
prove that the proposed scheme is privacy-preserving, efficient, and effective.},
DOI = {10.32604/cmc.2020.010562}
}