Qin Li, Wai Hong Chan, Chunhui Wu, Zhonghua Wen
Quantum signature (QS) is used to authenticate the identity of the originator, ensure data integrity and provide non-repudiation service with unconditional security using quantum theories. It can be generally considered as arbitrated QS if a trusted third party named arbitrator is involved, and true QS if otherwise. In this paper, we shall analyze why arbitrated QS is possible to sign quantum messages by providing a basic framework, and settle the disagreements between the impossibility of true QS [1] and an existing true QS scheme for quantum messages [2].
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http://arxiv.org/abs/1302.4528
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