Attribute-based Signature Scheme

In real life, one requires signatures from people who satisfy certain criteria like that they should possess some specific attributes. For example, Alice wants a document to be signed by some employee in Bob's company. This employee must have certain attributes such as being part of the IT staff and at least a junior manager in the cryptography team or a senior manager in the biometrics team. In order to satisfy these kinds of needs, we defined a common attribute-based signature scheme where the signing member has to have certain attributes or belong to a certain group, and we also proved our scheme to be secure.