Designated-Verifier Linkable Ring Signatures with unconditional anonymity.

In this work we propose Designated-Verifier Linkable Ring Signatures with unconditional anonymity, a cryptographic primitive that protects the privacy of signers in two different ways. First, it allows signers to hide inside a ring (an anonymity set of signers), which they can create by collecting a set of public keys all of which must be used for verification. Second, it allows a designated entity to simulate signatures, thus making it difficult for an adversary to deduce a signer’s identity from the content of the exchanged messages. To the best of our knowledge, our scheme is the first to combine linkable ring signatures with designated-verifier signatures, achieving unconditional anonymity without compromising any other security property of these schemes.