An attribute-based signature (ABS), is a cryptographic scheme where someone can sign message using any kind of predicates verified by the attributes he owns. For such scheme, it expected to be impossible for users collude if none them originally able on his own. The main advantage solution that signer remain anonymous in set fulfilling chosen predicate. It then used authentication instance. In ...

In this paper, we study probabilistic and rough set approaches to missing attribute values. Probabilistic approaches are based on imputation, a missing attribute value is replaced either by the most probable known attribute value or by the most probable attribute value restricted to a concept. In this paper, in a rough set approach to missing attribute values we consider two interpretations of ...