A novel attack strategy on entanglement swapping QKD protocols

作者：Schauer Stefan^*; Suda Martin

来源：International Journal of Quantum Information, 2008, 6(4): 841-858.

DOI：10.1142/S0219749908003736

• quantum key distribution
• quantum cryptography
• entanglement
• entanglement swapping
• attack strategy

Li et al. presented a protocol [International Journal of Quantum Information 4(6) (2006) 899-906] for quantum key distribution based on entanglement swapping. In this protocol, they use random and certain bits to construct a classical key, and they claim that this key is secure. In our article, we show that the protocol by Li et al. is insecure, presenting a new type of attack strategy which gives an adversary full information about the key without being detected. This strategy is based on entanglement swapping, too, and manages to preserve the correlation between the measurement results of the legitimate parties. Further, we present a modified version of the protocol and show that it is secure against this new attack strategy.

• 出版日期2008-8