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Improvement of a quantum broadcasting multiple blind signature scheme based on quantum teleportation
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.Comment: 22 page