Anonymous attribute-based designated verifier signature

Abstract

An Attribute-based signature (ABS), is a cryptographic scheme where someone can sign a message using any kind of predicates verified by the attributes he owns. For such scheme, it is expected to be impossible for users to collude to sign a message if none of them is originally able to sign the message on his own. The main advantage of such a solution is that the signer can remain anonymous in the set of users fulfilling the chosen predicate. It can then be used for anonymous authentication for instance.In this paper, our main contribution is a new designated verifier attribute based signature scheme. In other words, the signer is using his attributes to authenticate a message according to a predicate, and while doing so he can pick another policy such that only users owning attributes fulfilling this policy can check the validity of the signature. It can be used to extend anonymous authentication, ensuring that the designated ver-

Cost-effective anonymous data sharing with forward security using improved authentication

“…A method utilising a unique identifier ring signature Two typical model structures were presented in [19]. However, their initial construction was found to be incorrect [20], [21], and their second design is only proven secure in a lesser model, the selective-ID model. Han et al [22] are responsible for the first ID-based ring signature system stated to be safe in the standard model under the trusted setup assumption.…”