An Attribute-Based Anonymous Authentication Scheme

Proxy signature is a cryptographic primitive used for delegating the signing rights. It helps the proxy signer to sign messages on behalf of the original signer. This signature is used when the original signer is not available to sign a specific document. While several attribute-based signature schemes were proposed, unfortunately they do not have the nature of the agency. In this paper we first formally define a notion of the attribute-based proxy signature scheme. Then we propose an attribute-based proxy signature scheme. Finally we demonstrate that our scheme is efficiently and unforgeable under adaptive chosen-message attack under the Strong EDH assumption.