基于Bell态的量子安全多方求和

Quantum secure multiparty summation based on Bell states

利用纠缠交换中结果态和初始态之间存在的关系,提出一个基于Bell态的高效量子安全多方求和协议。该协议中,一个半可信第三方负责制备Bell态作为信号载体,并将这些载体粒子分发给参与者。随后,参与者根据其私密数据选择相应的局域幺正算子,对载体粒子进行编码操作。最后,参与者对其手中的粒子进行Bell基测量,半可信第三方就可以利用粒子初态和测量结果计算出求和结果。对协议中常见的外部和内部攻击的安全性分析表明所提协议在理论上是安全的。

Through the entanglement swapping between Bell states,the relationship between the resulting state and the initial state is illustrated and utilized to design an efficient quantum secure multiparty summation protocol.In the proposed protocol,a semi-trusted third party is introduced to generate Bell states and distribute them among participants.Then according to his private data,each participant performs the corresponding encoding operations on the Bell states.Finally,all participants make Bell states measurements on the particles in their hands and achieve entanglement swapping,and the third party can calculate the summation of the private inputs based on the measurement results and the initial states.The security analysis shows that the proposed protocol is secure against external and internal attacks in theory.