一个基于三粒子GHZ态与Bell态的量子代理盲签名方案

Quantum Proxy Blind Signature Scheme Based on Tripartite GHZ State and Bell State

提出一个基于可控隐形传态的量子代理盲签名方案.使用Bell态与三粒子Greenberger-Horne-Zeilinger(GHZ)态作为量子信道,来联系签名的三方:原始签名人Charlie,代理签名人Alice和签名验证人Bob.此方案采用异或运算盲化消息并将其按2-bit为一组编码为量子信息.Alice对自己手中粒子进行测量,根据测量结果产生一个对量子信息的代理盲签名.Charlie通过对持有的粒子进行测量操作帮助Alice完成签名.之后,Bob根据Charlie与Alice的测量结果,在余下的粒子上作合适的幺正变换,重构出消息并验证签名.在方案中,通过采用量子信道窃听检测,量子密钥分发协议,量子加密算法与纠缠粒子的相干性来保证方案的安全性,即本方案满足盲性,代理签名的可注销性,不可伪造性和不可否认性.

A quantum proxy blind signature scheme based on controlled quantum teleportation is proposed. Bell state and three particles Greenberger-Horne-Zeilinger（GHZ） state functions as quantum channel linking signature system three participants： original signer Charlie, proxy signer Alice and verifier Bob. This scheme adopts xor operator to blind message and codes it into quantum information with per 2-bit. Alice performs measurement on her particle and generates proxy blind signature for quantum message by measurement results. Cliarlie helps Alice complete signature via measurement his particle. Then, according Alice and Charlie measurement outcomes,Bob can reconstruct the original state on remain particle by applying appropriate unitary operation. In this scheme, quantum channel detect, quantum key distribution, encrypts algorithm and the entangle state are used to guarantee the scheme secret. Hence, the scheme satisfies the blind, cancellable, unforgeability and undeniability.