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Can Two-Way Direct Communication Protocols Be Considered Secure?

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Area of Science:

  • Quantum Information Science
  • Cryptography
  • Quantum Communication Security

Background:

  • Two-way quantum key distribution (QKD) protocols aim to establish secure communication channels.
  • Existing security proofs for QKD protocols are crucial for their practical implementation.

Purpose of the Study:

  • To analyze the security of two-way QKD protocols against a specific type of undetectable eavesdropping attack.
  • To evaluate the completeness of current security proofs for two-way QKD.

Main Methods:

  • Consideration of an eavesdropper copying all messages in the message mode of two-way QKD.
  • Analysis of message disturbance and mutual information between sender and receiver under attack.

Main Results:

  • Attacks involving undetectable message copying do not cause disturbance in the message mode.
  • Mutual information between sender and receiver remains constant at one under these attacks.

Conclusions:

  • Recent security proofs for two-way QKD protocols are incomplete.
  • These protocols are vulnerable to undetectable eavesdropping attacks that copy messages.