Design And Research Of Quantum Digital Signature Scheme

Digital signature is an important part of modern cryptography, it is also basic elements of many security protocols and cryptography scheme tectonics. As a handwritten signatures of simulation and extision, digital signatures has a very wide range of applications in network and information security domain. As is known to all, the safety of classic digital signature scheme is based on mathematical puzzle issues. However, in 1999, Peter Shor proposed a quantum algorithm, using quantum computers, Shor's algorithm can being used against all primes based on big integer factorization and discrete logarithm problem digital signature scheme. Therefore, the safety of digital signature faces a serious threat currently. It is necessary to study special property based on the quantum and to put forward quantum digital signature protocol, which is still safe in the quantum computer period .The main purpose of this paper is dedicated to research the digital signature of quantum and design safe and reliable quantum signature scheme.This paper firstly proposed a proxy signature scheme based on the quantum entanglement transform, which uses the entanglement character of Einstein– Podolsky - -Rosen (EPR), verifies the identity of of the proxy signer effectively. This new signature scheme has high safety coefficient,and its implementation is simple, and has the property of non-forgeability and verification and non-repudiationSecondly, a broadcast multiple quantum digital signature scheme was proposed, which encrypts messages to be signed by conducting CNOT operation, and uses the unitary transformation to realize information's signature and validation. Meanwhile the scheme. based on the quantum unconditional security of key distribution scheme to ensure the safety.Finally, the first to research the quantum partial blind signature and proposed a quantum partial blind signature scheme based on the identity authentication. To ensure the high safety of the the scheme and blind message , the schemes used arrangement particle sequence, and prepare some decoy state to establish safe quantum channel to ensure the safety of the scheme. In the scheme ,the signers uses the identity authentication technology to identify the sender's, not only effectively reduce the signature of the junk messages but also improved the signature efficiency.