Research And Application Of Information Signature Based On Quantum Cryptography

With the rapid development of information technology,communication security has become an essential requirement for information security. However, the traditional cryptographic systems cannot guarantee unconditional security because they have no capacity to check the simple eavesdropping. Therefore, quantum cryptography is proposed for its two basic properties: unconditional security and eavesdropping detectability.Digital signature, which serves as a basic module to design cryptography protocols, is widely used in practical application. To satisfy the special requirements in the wide application of E-commerce and E-voting, blind signature and group signature are widely studied. However, the classical blind and group signatures cannot guarantee the unconditional security. As a result, the research on quantum blind and group signatures is of sufficient significance.In this thesis, we have proposed several quantum signature protocols, which adopt the Entangled Quantum Effect and Heisenberg Uncertainty Principle. The main contributions of this thesis are as follows:First, we are the first to introduce the concept of quantum blind signature. Then, the weak and strong blind signature protocols based on quantum entanglement particles are proposed. Different from classical blind signature schemes and current quantum signature schemes, our schemes could guarantee not only the unconditional security but also the anonymity of the message owner.Second, this thesis is the first to propose the concept of quantum group signature. Unlike the classical group signature and quantum signature schemes, our schemes could guarantee the unconditional security and protect the inner structure of the organization.Third, to the best of our knowledge, we are the first to apply the quantum signature protocols to E-payment systems. Compared with existing E-payment systems, our quantum E-payment schemes could protect not only the user's anonymity but also the inner structure of the customer group. In addition, our system adopts the mechanisms of Audit and two TTPs to enhance the unconditional security.The proposed protocols are of profound theoretical significance. With the development of quantum experimenting technology, our protocols will get widespread applications.