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In 2009, Yen et al. [Quantum Inf. Comput. 9(5–6):376–394, 2009] proposed a quantum direct communication along with an authentication protocol using Einstein-Podolsky-Rosen states. This study points out several attacks on Yen et al.’s protocol, in which a malicious Trent can launch either an intercept-resend attack to reveal the secret information of a sender or an impersonation attack to impersonate...
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