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In conventional ID-based user authentications, privacy issues may occur, since users' behavior histories are collected in Service Providers (SPs). Although anonymous authentications such as group signatures have been proposed, these schemes rely on a Trusted Third Party (TTP) capable of tracing misbehaving users. Thus, the privacy is not high, because TTP can always trace users. Therefore, the anonymous...
A group signature scheme allows a user to anonymously sign a message on behalf of a group. One of important issues in group signature schemes is the user revocation. Previously, Libert et al. proposed an elegant revocable group signature scheme with O(1) signing/verification costs, O(1) signature size, O(1) membership certificate size, and O(log N) public key size, where N is the number of group members...
Anonymous credential systems enable a user to assure a service provider anonymously the ownership of his certified attributes. We have previously proposed an anonymous credential system to prove that user's attributes satisfy a monotone formula, i.e., a logic relation with any AND/OR combinations without negations. However, this system has a limitation where the user can prove the formula only using...
An anonymous credential system allows a user to convince a service provider anonymously that he/she owns certified attributes. Previously, we proposed an anonymous credential system to prove user's attributes to satisfy a monotone formula, i.e., A logic relation with any combination of AND/OR relations. However, this system has a restriction that the user can prove the monotone formula when only one...
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