Improving the Security of "Measurement-Device-Independent Quantum Communication without Encryption"
This work addresses security flaws in quantum communication protocols, which is crucial for ensuring privacy in quantum networks, though it is incremental as it builds on prior protocols.
The authors identified security vulnerabilities in two existing quantum communication protocols, showing that a third party could obtain half of the secret information without active attacks, and they proposed modifications to enhance security.
Recently in 2018, Niu et al. proposed a measurement-device-independent quantum secure direct communication protocol using Einstein-Podolsky-Rosen pairs and generalized it to a quantum dialogue protocol (Niu et al., Science bulletin 63.20, 2018). By analyzing these protocols we find some security issues in both these protocols. In this work, we show that both the protocols are not secure against information leakage, and a third party can get half of the secret information without any active attack. We also propose suitable modifications of these protocols to improve the security.