信息网络安全 ›› 2017, Vol. 17 ›› Issue (6): 56-61.doi: 10.3969/j.issn.1671-1122.2017.06.009

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Quantum Key Agreement Protocol Based on Bell Measurement and Three-particle Entanglement

SHI Jinjing, CHENG Jiajing, CHEN Hui, ZHOU Fang   

  1. Institute of Information Science and Engineering, Central South University, Changsha Hunan 410083, China
  • Received:2017-05-01 Online:2017-06-20

Abstract: The controlled non-gate attack can use the correlation between the quantum entangled bits to eavesdrop the shared secret key. Inspired by this kind of attacks, this paper proposed a quantum key agreement protocol based on Bell measurement and three particle-entangled states for the security and efficiency problems that may be faced in quantum key agreement (QKA). This protocol applies a Controlled-NOT gate to convert the Bellen tangled bits and a single bit into a three-particle entangled state, and negotiate the quantum key agreement between Alice and Bob with unitary operations and Bell measurements.The theoretical analysis shows, the protocol whose quantum efficiency is 40% is safe and efficient, and its security is manifested as that it can resist both the external eavesdropper attacks and the internal attacks. Compared with the protocol of Hsueh[1]and Shen[2], either side of the two sides in the protocol cannot separately determine the shared secret key in advance, and the two participants have the same contribution to the shared secret key.

Key words: quantum key agreement, three-particle entanglement, Bell measurement

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