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International Journal of Modern Physics B

REALIZABLE QUANTUM BROADCASTING MULTI-SIGNATURE SCHEME

Xiaojun Wen, Yun Liu, Nanrun Zhou

Published Sep 30, 2008• 25 citations
Publisher

Abstract

Two quantum broadcasting multi-signature schemes are presented: one is used to sign classical digital messages and the other to sign quantum messages. The quantum one-way function is used to realize signature and verification in the digital multi-signature scheme, while quantum teleportation is used in the quantum multi-signature scheme. The proposed schemes support infinite amounts of signatories and provide a novel and experimentally feasible method to construct multi-signature quantum signature systems within current technology.

DOI
10.1142/s0217979208048899

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Two quantum broadcasting multi-signature schemes are presented: one is used to sign classical digital messages and the other to sign quantum messages. The quantum one-way function is used to realize signature and verification in the digital multi-signature scheme, while quantum teleportation is used in the quantum multi-signature scheme. The proposed schemes support infinite amounts of signatories and provide a novel and experimentally feasible method to construct multi-signature quantum signature systems within current technology.
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Digital signatures are the building blocks of modern communication to prevent masquerading by any party other than recipients, repudiation by signatory and forgery by any individual recipient. Digital signature scheme is said to be standard if the signature (a) is a pattern depending upon the message to be signed, (b) is built upon some information publically known and unique to the signatory, (c) can be stored by all the recipients. While classical methods provide computational security only, quantum mechanics guarantees information-theoretically secure and standard digital signature schemes. However, standard quantum digital signature schemes are based on quantum one-way functions and hence require long term quantum memory for storing quantum signatures, which is not practically feasible yet. We demonstrate here a standard quantum digital signature scheme by replacing quantum one-way functions with multiparty controlled EPR channels. It allows signatory to generate non-locally correlated quantum signatures, instead of multiple copies of a unique quantum state, and assures security against any individual since others have non-locally correlated information.
A quantum digital signature scheme based on quantum mechanics is proposed in this paper. The security of the protocol relies on the existence of quantum one-way functions by fundamental quantum principles. Our protocol involves a so-called arbitrator who validates and authenticates the signed message. This scheme uses public quantum keys publicized by the signatory to verify the validity of the signature and uses quantum one-time pad to ensure the security of quantum information on channel. To guarantee the authenticity of the transmitted quantum states, a family of quantum stabilizer code is employed. The proposed scheme presents a novel method to construct secure quantum signature systems for future secure communications
Digital signature schemes are often used in interconnected computer networks to verify the origin and authenticity of messages. Current classical digital signature schemes based on so-called “one-way functions” rely on computational complexity to provide security over sufficiently long timescales. However, there are currently no mathematical proofs that such functions will always be computationally complex. Quantum digital signatures offers a means of confirming both origin and authenticity of a message with security verified by information theoretical limits. The message cannot be forged or repudiated. We have constructed, tested and analyzed the security of what is, to the best of our knowledge, the first example of an experimental quantum digital signature system.
Recently, a broadcasting multiple blind signature scheme based on quantum teleportation has been proposed for the first time. It is claimed to have unconditional security and properties of quantum multiple signature and quantum blind signature. In this paper, we analyze the security of the protocol and show that the signatory Ui can learn the signed message m by a single particle measurement and the signed message m can be modified at random by anyone according to the scheme. Furthermore, there are some participant attacks and external attacks existing in the scheme. Finally we present an improved protocol and show that the improved scheme can resist all of the mentioned attacks. Meanwhile, the secret keys can be used again and again, which will make it more efficient and practical.