Cryptanalysis of quantum digital signature for the access control of sensitive data

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Quantum digital signature provides a new way to ensure both integrity and transferability of digital messages with information-theoretic security. In this work, we give a cryptanalysis of quantum digital signature protocol for the access control of sensitive data in the big data era, and propose two new attack strategies on this protocol. In the first attack, the receiver Bob can forge a valid message–signature pair by a new known-message attack in this protocol. In the second attack, the signer Alice can successfully deny her signature. Furthermore, we discuss how to deal with these security problems and give some possible ways to improve this protocol.