Comment on : Quantum direct communication with authentication

@article{Zhang2007CommentO,
  title={Comment on : Quantum direct communication with authentication},
  author={Zhan-jun Zhang},
  journal={Physical Review A},
  year={2007},
  volume={75},
  pages={026301}
}
  • Zhan-jun Zhang
  • Published 18 April 2006
  • Computer Science, Physics
  • Physical Review A
Two protocols of quantum direct communication with authentication [Phys. Rev. A 73, 042305 (2006)] were recently proposed by Lee, Lim, and Yang. In this paper we will show that in the two protocols the authenticator Trent should be prevented from knowing the secret message. The first protocol can be eavesdropped on by Trent using the intercept-measure-resend attack, while the second protocol can be eavesdropped on by Trent using a simple single-qubit measurement. To fix these leaks, we revise… 

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