Abstract
Quantum digital signature offers an information theoretically secure way to guarantee the identity of the sender and the integrity of classical messages between one sender and many recipients. The existing unconditionally secure protocols only deal with the problem of sending single-bit messages. In this paper, we modify the model of quantum digital signature protocol and construct an unconditionally secure quantum digital signature protocol which can sign multi-bit messages at one time. Our protocol is against existing quantum attacks. Compared with the previous protocols, our protocol requires less quantum memory and becomes much more efficient. Our construction makes it possible to have a quantum signature in actual application.
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