The Journal of China Universities of Posts and Telecommunications ›› 2022, Vol. 29 ›› Issue (4): 42-50.doi: 10.19682/j.cnki.1005-8885.2022.2018

• Special Topic: Quantum Science and Technology • Previous Articles     Next Articles

New controlled quantum key agreement protocols based on Bell states

He Yefeng, Yue Yuru, Li Guoqing, Liu Jixiang, Di Man, Pang Yibo   

  1. School of Cyberspace Security, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
  • Received:2022-04-28 Revised:2022-06-01 Accepted:2022-06-10 Online:2022-08-31 Published:2022-08-31
  • Contact: Yue Yuru, E-mail:
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (61802302) and the Basic Research
    Project of Natural Science of Shaanxi Province (2021JM'462).

Abstract: The controlled quantum key agreement (CQKA) protocol requires a controller to oversee the process of all participants negotiating a key, which can satisfy the needs of certain specific scenarios. Existing CQKA protocols are mostly two-party or three-party, and they do not entirely meet the actual needs. To address this problem, this paper proposes new CQKA protocols based on Bell states and Bell measurements. The new CQKA protocols can be successfully implemented for any N-party, not just two-party. Furthermore, the security and efficiency analyses demonstrate that the new CQKA protocols are not only secure but also more efficient in terms of quantum bit.

Key words: quantum cryptography, quantum key agreement, controlled quantum key agreement, Bell states, controller

CLC Number: