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Physica Scripta

Cryptanalysis and improvement of quantum secure communication network protocol with entangled photons for mobile communications

Gan Gao

Published Nov 25, 2014• 3 citations
Publisher

Abstract

Recently, a communication protocol called controlled bidirectional quantum secret direct communication for mobile networks was proposed by Chou et al (2014 Mobile Netw. Appl. 19 121). We study the security of the proposed communication protocol and find that it is not secure. The controller, Telecom Company, may eavesdrop secret messages from mobile devices without being detected. Finally, we give a possible improvement of the communication protocol.

DOI
10.1088/0031-8949/89/12/125102

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Recently, a communication protocol called controlled bidirectional quantum secret direct communication for mobile networks was proposed by Chou et al (2014 Mobile Netw. Appl. 19 121). We study the security of the proposed communication protocol and find that it is not secure. The controller, Telecom Company, may eavesdrop secret messages from mobile devices without being detected. Finally, we give a possible improvement of the communication protocol.
In a recent letter, a controlled bidirectional quantum secure direct communication protocol with cluster states was proposed. We analyzed the security of this protocol and found that it is insecure. In the original protocol, a dishonest controller can eavesdrop the secret messages exchanged between the users, and a dishonest user may achieve his communication goal without the permission of the controller. The corresponding two kinds of attack strategies are presented. Finally, we give a feasible improvement of this communication protocol.
The security of controlled bidirectional quantum direct communication using a GHZ state [Chin. Phys. Lett. 23 (2006) 1680] is analyzed. It turns out that the MX protocol has the problem of definite information leakage, i.e., the first bit of a secret message from any communication party is always leaked out without any active attack after the controller's announcement of measurement results. We put forward two approaches to improve this. The first is to merely modify the encoding rule of the MX protocol, while the second is to use a Bell state as the quantum resource instead of a GHZ state. Both our approaches can ensure that all the bits of secret messages from two communication parties are not leaked out after the controller's announcement of measurement results. Moreover, the controlled bidirectional quantum secure direct communication protocol based on the second approach is more convenient to implement than the MX protocol, since it merely uses a Bell state as the quantum resource and only needs to perform the Bell-basis measurement.
A controlled bidirectional quantum secure direct communication protocol without information leakage was proposed.In the proposed protocol,two authenticated communication parties,Alice and Bob,were able to securely exchange their secret messages simultaneously under the control of the controller,Charlie.The problem of information leakage was overcome by making full use of the measurement correlation property after entanglement swapping among three Bell states.Moreover,the proposed protocol merely took the Bell state as quantum resource and merely needed the Bell measurement so that it was convenient to implement.Security analysis shows that the proposed protocol can detect not only the active attacks from the outside eavesdropper,but also the dishonest behavior from the controller,Charlie.It can be concluded that the proposed protocol has good security.
A security loophole exists in Gao et al.'s controlled quantum secure direct communication protocol. By employing the security loophole, the receiver can obtain the secret message sent by the sender without the permission of the controller in their protocol. In order to avoid this loophole, we present an improved protocol in this paper. In the improved protocol, entangled particles are prepared at random in two GHZ-like states, which ensure that the receiver is not able to recover the secret message without knowing the initially entangled state. Compared with the other improved version whose security depends on the perfect quantum channel, our improved protocol is secure in a noisy quantum channel. Therefore, our protocol is more practical.