J4 ›› 2016, Vol. 33 ›› Issue (1): 44-50.

• Quantum Optics • Previous Articles     Next Articles

Intercept-resent Eavesdropping in the Polarization-drift Quantum Cryptography Based on B92 Protocol

ZHANG Zhi-yong, WANG Yan-bo, HE Min, WANG Jian   

  1. PLA University of Science and Technology, Nanjing 210007, China
  • Received:2014-12-16 Revised:2015-01-09 Published:2016-01-28 Online:2016-01-06

Abstract:

The intercept-resent eavesdropping is explored in the polarization-drift quantum cryptography. Two-dimension model is used to describe the key distribution process. Model analysis and calculation provide precise relation between legitimate communicators and eavesdroppers. We obtain the loss of detection efficiency and the fluctuation of QBER. The mutual information in the sifted keys shows that, comparing to the BB84 protocol, the mutual information in the B92 protocol is lower, which is caused by the simplified states from four states to two states. The information obtained by an eavesdropper can be more than that in the legitimate partners, which will threaten the privacy of the keys generated.

Key words: B92 protocol; quantum cryptography; polarization drift; quantum key distribution; intercept-resent attack

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