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Comment on “controlled quantum secure direct communication with authentication protocol based on five-particle cluster state and classical XOR operation"

Quantum Information Processing, ISSN: 1573-1332, Vol: 20, Issue: 10
2021
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Article Description

Recently, a controlled quantum secure direct communication (CQSDC) with authentication protocol based on the five-particle cluster state and the classical XOR operation was put forward (Quantum Inf Process 18:129, 2019). However, it is found that this CQSDC protocol has some serious security problems. Firstly, it is weak against disturbance attack from an outside eavesdropper and even the dishonest controller. Secondly, it is found that the receiver can obtain one half of the information about the secret message without the controller’s permission. This is not allowed in a truly secure CQSDC protocol. In order to mend these security loopholes, some improving measures are discussed.

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