Protective Technology

Group Signature Library (GSSLib) is a Java library (GSS library) and part of the PRISMACLOUD FLEXAUTH cryptographic tool that supports group signature schemes, a variant of signature schemes which help to enhance the privacy of the signers. In particular in group signatures a group manager can set up a group so that every member of this group can anonymously generate a signature on behalf of the group. In addition there is an opening authority which can revoke the anonymity of the users in case of misbehaviour.

The topology certification tool supports the application of graph signatures to certify and prove properties of topologies. The tool is realized as an interactive protocol framework between the roles of an issuer, a prover and a verifier. The tool assumes that the topology is provided by another entity in a standard graph format. The issuer is responsible for the certification of the encoding for the topology certification framework, as well as for issuing a topology certificate to the prover.

This tool supports the authentication of arbitrary messages (or documents) by means of digital signatures with selective disclosure features. This tool has three different components, being an authentication component, a selective disclosure component, and a verification component. Given a signed message from the authentication component, the selective disclosure component can selectively disclose parts of the information of the original signed message (or document) to other receiving parties.

Through the platform, it is possible for existing solutions to be re-used by integrating them into the federation, resulting in better resource utilisation of Public Sector cloud infrastructures as well as faster and cheaper deployment of interoperable and scalable public services.