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Card-style identity management systems have been developed to help users control their digital identities stored at different identity providers. However, current card-style identity management systems are lack of the ability to evaluate the risk of user’s identities. So it is necessary to assist users by presenting the risk of every identity when the identities are to be released to the service providers. In this paper, a privacy attribute ontology based risk evaluation model is proposed to enhance the privacy of card-style identity management systems.
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