Blind signature is the concept to ensure anonymity of e-coins. Untracebility and unlinkability are two main properties of real coins, which require mimicking electronically. Whenever a user is permitted to spend an e-coin, he is in need to fulfill above requirements of blind signature. This paper proposes a proxy blind signature scheme with which a proxy is able to make proxy blind signature wh...

A proxy blind signature combines the properties of proxy signature and blind signature. Recently, Awasthi and Lal proposed a more efficient proxy blind signature based on the proxy signature scheme proposed by Mambo et al.. Later, Sun et al. and Das et al. gave some attacks on Awasthi and Lal’s scheme respectively. In this paper, we analyze the two attacks and we point out that those attacks do...

As a special anonymous signature, the blindness of blind signatures makes it to play an important role in electronic commerce. Sometimes, we need a blind signature under the multiple signers. However, to the best of our knowledge, the research on the blind signer for multiple signers is much less. In this paper, we propose a novel blind signature scheme for multiple signers based on a new secur...

Directed signature is the solution of such problems when the signed message contains information sensitive to the signature receiver. Generally, in many application of directed signature, the signer is generally a single person. But when the message is on behalf of an organization, a valid sensitive message may require the approval of several people. Threshold signature schemes are used to solv...

Blind signature allows one user to get a signature without giving the signer any information about the actual message or the resulting signature. In this paper, we aim to improve the recently proposed Lin et al.’s Self-certified Partially Blind Signature Scheme[1] in order to withstand the security flaw in their scheme. The security of the improved scheme is enhanced in the blind signing phase ...

A proxy blind signature scheme is a special form of blind signature which allows a designated person called proxy signer to sign on behalf of two or more original signers without knowing the content of the message or document. It combines the advantages of proxy signature, blind signature and multi-signature scheme and satisfies the security properties of both proxy and blind signature scheme. ...

Using Russian digital signature (DS) standards as the underlying scheme there are designed the blind DS protocols that are the first known implementation of the blind DS based on signature standards. There are also proposed blind collective DS protocols based on the DS standards. The last protocols are also the first implementation of the blind multi-signature schemes using the signature verifi...

David Chaum has introduced the idea of blind signamres, an extension of the concept of digital signatures, as a way to protect the identity and privacy of a user in electronic payment and service networks. Blind signatures also prevent so-called 'dossier creation " about users by organizations. While the concept of blind signatures still allows authorities to distinguish between valid and false...

A blind signature scheme is a cryptographic primitive in which a user can obtain a signature from the signer without revealing any information about message signature pair. Blind signatures are used in electronic payment systems, electronic voting machines etc. The anonymity of blind signature scheme can be misused by criminals by money laundering or by dubious money. To prevent these crimes, t...