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The security of the quantum secure deterministic communication scheme [Chin. Phys. 16 (2007) 2549] is reex- amined. A security loophole is pointed out. Taking advantage of this loophole, an eavesdropper can steal all the secret messages without being detected by an intercept-and-resend attack strategy. Furthermore, a possible improvement on this protocol is presented. It makes the modified protocol secure against this kind of attack.
The security of the quantum secure deterministic communication scheme [Chin. Phys. 16 (2007) 2549] is reexamined. A security loophole is pointed out. Taking advantage of this loophole, an eavesdropper can steal all the secret messages without being detected by It makes the modified protocol secure against this kind of attack.