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International Conference on Information Security and Intelligent Control (ISIC)

Improved “bidirectional quantum secure communication protocol based on a shared private Bell state”

Ching‐Ying Lin, Tzonelih Hwang

Published Aug 1, 2012• 0 citations
Publisher

Abstract

In 2009, Shi et al. [Opt. Commun. 282 (2009) 2460-2463] proposed a bidirectional quantum secure communication protocol based on a shared private Bell state. The protocol allows two legitimate users to exchange their secret messages simultaneously and is free from information leakage. This work tries to use random permutation on photons to reduce the communication cost and enhance the quantum bit efficiency on Shi et al.'s protocol.

DOI
10.1109/isic.2012.6449726

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In 2009, Shi et al. [Opt. Commun. 282 (2009) 2460-2463] proposed a bidirectional quantum secure communication protocol based on a shared private Bell state. The protocol allows two legitimate users to exchange their secret messages simultaneously and is free from information leakage. This work tries to use random permutation on photons to reduce the communication cost and enhance the quantum bit efficiency on Shi et al.'s protocol.
A multiparty controlled bidirectional quantum secure direct communication and authentication protocol is proposed based on EPR pair and entanglement swapping. The legitimate identities of communicating parties are encoded to Bell states which act as a detection sequence. Secret messages are transmitted by using the classical XOR operation, which serves as a one-time-pad. No photon with secret information transmits in the quantum channel. Compared with the protocols proposed by Wang et al. [Acta Phys. Sin. 56 (2007) 673; Opt. Commun. 266 (2006) 732 ], the protocol in this study implements bidirectional communication and authentication, which defends most attacks including the 'man-in-the-middle' attack efficiently.
We propose a novel protocol for controlled bidirectional quantum secure communication based on a nonlocal swap gate scheme. Our proposed protocol would be applied to a system in which a controller (supervisor/Charlie) controls the bidirectional communication with quantum information or secret messages between legitimate users (Alice and Bob). In this system, the legitimate users must obtain permission from the controller in order to exchange their respective quantum information or secret messages simultaneously; the controller is unable to obtain any quantum information or secret messages from the decoding process. Moreover, the presence of the controller also avoids the problem of one legitimate user receiving the quantum information or secret message before the other, and then refusing to help the other user decode the quantum information or secret message. Our proposed protocol is aimed at protecting against external and participant attacks on such a system, and the cost of transmitting quantum bits using our protocol is less than that achieved in other studies. Based on the nonlocal swap gate scheme, the legitimate users exchange their quantum information or secret messages without transmission in a public channel, thus protecting against eavesdroppers stealing the secret messages.
In light of Lucamarini–Mancini's secure deterministic communication without entanglement [Phys. Rev. Lett94, (2005) 140501], by introducing an additional operation for encoding and additional classical information for decoding, we propose a new secure deterministic bidirectional communication protocol without using entanglement. In our protocol, two legitimate users can simultaneously exchange their different secret messages in a direct way with a set of communication devices. The proposed protocol is asymptotically secure in the limit of transmitting long messages.
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.
We are introducing an efficient bidirectional quantum secure direct communication protocol that employs the four qubit cluster states, creating a novel quantum channel based on dense coding between the transmitter and receiver. By dense coding, after a conventional announcement, two legitimate users can simultaneously exchange their messages. Two safety checking measures are taken to ensure safe transmission. Information leaking is not an issue in this protocol, and it is secure against some well-known eavesdropping assaults. It is also accessible with cutting-edge technology.