Designated verifier signature (DVS) is a cryptographic primitive that allows a signer to convince a verifier the validity of a statement in a way that the verifier is unable to transfer the conviction to a third party. In DVS, signatures are publicly verifiable. The validity of a signature ensures that it is from either the signer or the verifier. Strong DVS (SDVS) enhances the privacy of the s...

A designated verifier signature (DVS) scheme is a special type of digital signature scheme without the property of non-repudiation. Such schemes only allow the designated verifier to validate the signer’s signature. Meanwhile, the designated verifier is not able to convince any third party of the signature’s actual signer, since he can also generate a computationally indistinguishable one compa...

Designated verifier signature is a cryptographic primitive which allows a signer to convince a designated verifier of the validity of a statement but in the meanwhile prevents the verifier from transferring this conviction to any third party. In this work we present the first identity-based designated verifier signature scheme that supports non-delegatability, and prove its security in the rand...

Undeniable signatures are digital signatures which are not universally veri able but can only be checked with the signer's help. However, the signer cannot deny the validity of a correct signature. An extended concept, convertible undeniable signatures, allows the signer to convert single undeniable signatures or even the whole scheme into universally veri able signatures or into an ordinary di...

Multi-Designated Verifier Signature (MDVS) is a privacy-oriented signature scheme in which the signature produced can only be verified by a specific set of users. A generic MDVS scheme was proposed recently, which can be constructed from some ring signature schemes and a secure multi-party computation (SMC) protocol. In this paper, we try to remove the requirement of the costly SMC. We propose ...

A convertible multi-authenticated encryption (CMAE) scheme allows a group of signers to cooperatively produce a valid authenticated encryption signature and still preserves the characteristic of convertible authenticated encryption (CAE) schemes. In 2008, Tsai proposed a CMAE scheme based on the intractability of one-way hash functions and discrete logarithms. However, we find that Tsai’s schem...

This paper proposes a designated verifier signature based on the Schnorr signature scheme. One of the advantages of the new scheme compared with the one proposed by Jakobsson, Sako and Impagliazzo is that not only the designated verifier (Bob) cannot convince a third party (Cindy) that a signature is originated by a given signer (Alice), but also nobody else other than Bob can even check the va...

Undeniable signatures are digital signatures which are not universally veriiable but can only be checked with the signer's help. However, the signer cannot deny the validity of a correct signature. An extended concept , convertible undeniable signatures, allows the signer to convert single undeniable signatures or even the whole scheme into universally veriiable signatures or into an ordinary d...