Blind Signature Scheme Based On Quantum Secret Sharing

With the development of computer performance, especially the appearance of the quantum computer, all the classical cryptography will not secure based on mathematical complexity, digital signature will also become unsafe. The quantum cryptography based on physical properties, its security proved to be unconditionally, therefore, quantum digital signature based on quantum characteristics is a valuable research direction. At present, the research of quantum cryptography, including quantum secret distribution, quantum secret sharing(QSS), quantum identity authentication and quantum secure direct communication. The first QSS protocol was proposed in 1999 by Hillery etc, which make use of GHZ entangled state, after that more and more new schemes in theoretical and experimental aspects were put forward. Classical digital signature has many different types, such as proxy signature, group signature, threshold signature scheme etc. In this thesis, the mainly secret sharing principle is applied to the blind signature scheme, to improve the security of the signature using the physical properties of quantum. The main research results of this paper are:1. Propose a blind signature scheme based on quantum secret sharing. Quantum secret sharing takes advantage of Bell entangled states and decoy photons; Blind signature uses XOR operations and Hash function. Bell entangled states are the easiest entangled, and XOR operation is simple to operate; decoy photons and Hash functions to ensure the safety.2. Put forward another blind signature scheme based on quantum secret sharing. The two schemes have same principle, but in this program, secret sharing system utilizes quantum key distribution and quantum correlation principle; blind signature makes use of fingerprinting function and one-time quantum encryption algorithm, not only ensure the quantum unconditional security, but also meet the blind signature non-repudiation and unforgeability.3. Through integrated programs 1 and 2, proposes a new blind signature scheme based on quantum secret sharing, this two schemes have same principle. The new program combines the two schemes’advantages, steps are more straight and actual operation is more feasible.