Search

Quantum key agreement(QKA) is an important part of quantum cryptography. In QKA, the final shared key must be negotiated equally by all participants, and any nontrivial subset of participants cannot fully determine the shared key. In this scheme, a novel three-party QKA with quantum fourier transform(QFT) is proposed. In addition, we utilize random numbers, decoy states and a hash function to make this protocol be resistant external attacks and participant attacks. Furthermore, the scheme can meet fairness i.e. each participant contributes fairly and equally to the final key. [ABSTRACT FROM AUTHOR]

As an important topic of quantum cryptography, quantum voting has attracted more and more attentions recently. However, with our analysis, it can be seen that there exist some serious problems in a particular quantum voting model. Firstly, the voter does not have the ability to vote as his own. Secondly, the voter may be dishonest and can deny some corresponding voting results. Furthermore, some improvements will be presented to solve the loopholes. [ABSTRACT FROM AUTHOR]

As an important topic of quantum cryptography, quantum proxy blind signature has attracted more and more attentions in recent years. However, with our analysis, it can be seen that there exists a common security loophole in two particular quantum proxy blind signature schemes, i.e., the receiver can forge a valid signature without being caught by others. In order to show that, the detailed attack strategy and the potential improved ideas are proposed in this paper. [ABSTRACT FROM AUTHOR]