Abstract
Quantum digital signatures can be used to authenticate classical messages in an information-theoretically secure way. Previously, a novel quantum digital signature for classical messages has been proposed and gave an experimental demonstration of distributing quantum digital signatures from one sender to two receivers. Some improvement versions were subsequently presented, which made it more feasible with present technology. These proposals for quantum digital signatures are basic building blocks which only deal with the problem of sending single bit messages while no-forging and non-repudiation are guaranteed. For a multi-bit message, it is only mentioned that the basic building blocks must be iterated, but the iteration of the basic building block still does not suffice to define the entire protocol. In this paper, we show that it is necessary to define the entire protocol because some attacks will arise if these building blocks are used in a naive way of iteration. Therefore, we give a way of defining an entire protocol to deal with the problem of sending multi-bit messages based on the basic building blocks and analyse its security.
Highlights
Quantum digital signatures can be used to authenticate classical messages in an information-theoretically secure way
Some improvement versions were subsequently presented, which made it more feasible with present technology. These proposals for quantum digital signatures are basic building blocks which only deal with the problem of sending single bit messages while no-forging and non-repudiation are guaranteed
Based on the basic building blocks in these proposals[5,6,7,8], we propose an entire protocol to deal with the problem of sending multi-bit messages, in which the rules on how to resolve disputes, and how to prove the validity of a multi-bit message and so on are given
Summary
Quantum digital signatures can be used to authenticate classical messages in an information-theoretically secure way. Some improvement versions were subsequently presented, which made it more feasible with present technology These proposals for quantum digital signatures are basic building blocks which only deal with the problem of sending single bit messages while no-forging and non-repudiation are guaranteed. We give a way of defining an entire protocol to deal with the problem of sending multi-bit messages based on the basic building blocks and analyse its security. In contrast with other DS schemes, this kind of proposals[5,6,7,8] have an important advantage: the trusted authorities are not needed any longer These QDS proposals[5,6,7,8] are basic building blocks, which only deal with the problem of sending single bit messages while no-forging and non-repudiation are guaranteed. For a long multi-bit message, it is only mentioned that the basic building blocks must be iterated, but the iteration of the basic building blocks still does not suffice to define the entire protocol, and there still must be an additional set of rules which stipulate how disputes are resolved, or how validity of a long message is proven and so on
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