This paper proposes a designated verifier signature scheme based on the Schnorr signature and the Zheng signcryption schemes. One of the advantages of the new scheme compared with all previously proposed schemes is that it achieves the “strong designated verifier” property without encrypting any part of the signatures. This is because the designated verifier’s secret key is involved in the veri...

At Crypto’89, Chaum and van Antwerpen first introduced the concept of undeniable signatures, which has a special property such that a signature cannot be verified without the signer’s cooperation. In 1996, Jakobsson, Sako, and Impagliazzo proposed a not-interactive undeniable signature scheme by employing a new primitive called designated verifier proofs. However, this paper shows that their sc...

In a multi-proxy signature scheme, an original signer delegates his signing power to a group of proxy signers. Then the group of proxy signers cooperatively generates a multi-proxy signature on behalf of the original signer; and any one can verify the validity of the multi-proxy signature. But, when the signed message is sensitive to the signature receiver, it is necessary to combine the concep...

In this paper, we present a universal forgery attack on Kang et al.’s identity-based strong designated verifier signature (IBSDVS) scheme. We show anyone can forge a valid IBSDVS on an arbitrary message without the knowledge of the private key of either the signer or the designated verifier. Moreover, we point out that Kang et al.’s scheme does not satisfy the properties of strongness and nonde...

In a designated verifier proxy signature scheme, there are three participants, namely, the original signer, the proxy signer, and the designated verifier. The original signer delegates his or her signing right to the proxy signer, then the proxy signer can generate valid signature on behalf of the original signer. But only the designated verifier can verify the proxy signature. Several designat...

A Designated Verifier Signature (DVS) scheme has the property of signer ambiguity, which can only convince a designated verifier of the signer’s identity. It is not allowed for the designated verifier to transfer the conviction to any third party. A Strong Designated Verifier Signature (SDVS) scheme further requires the designated verifier’s private key to perform the signature verification, so...

The concept of universal designated verifier signatures was introduced by Steinfeld, Bull, Wang and Pieprzyk at Asiacrypt 2003. These signatures can be used as standard publicly verifiable digital signatures but have an additional functionality which allows any holder of a signature to designate the signature to any desired verifier. This designated verifier can check that the message was indee...

A non-delegatable identity-based strong designated verifier signature scheme Bin Wang Information Engineering College of Yangzhou University Yangzhou City, Jiangsu Province, 225009, P.R.China E-mail:[email protected] Abstract: In a strong designated verifier signature scheme, no third party can verify the validity of a signature. On the other hand, non-delegatability, proposed by Lipmaa, Wang an...

Recently Lee-Chang proposed a new strong designated verifier signature scheme. They claimed that their proposed scheme is more secure and suitable for the purpose of a strong designated verifier signature scheme. This paper shows that Lee-Chang scheme cannot withstand forgery attack which an adversary can forge a signature without knowing the secret key of the signer or the designated verifier ...