Quantum direct communication with mutual authentication

Authors:
Cheng-An Yen;Shi-Jinn Horng;Hsi-Sheng Goan;Tzong-Wann Kao;Yao-Hsin Chou
Affiliations:
Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan;Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan and Department of Electronic Engineering, National United Universit ...;Department of Physics, Center for Quantum Science and Engineering, and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan;Department of Electronic Engineering, Technology and Science Institute of Northern Taiwan, Taipei, Taiwan;Department of Computer Science and Information Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
Venue:
Quantum Information & Computation
Year:
2009

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Abstract

In this paper, we first point out that some recently proposed quantum direct communi-cation (QDC) protocols with authentication are vulnerable under some specific attacks,and the secrete message will leak out to the authenticator who is introduced to authen-ticate users participating in the communication. We then propose a new protocol that iscapable of achieving secure QDC with authentication as long as the authenticator woulddo the authentication job faithfully. Our quantum protocol introduces a mutual authen-tication procedure, uses the quantum Bell states, and applies unitary transformations inthe authentication process. Then it exploits and utilizes the entanglement swapping andlocal unitary operations in the communication processes. Thus, after the authenticationprocess, the client users are left alone to communicate with each other, and the authen-ticator has no access to the secrete message. In addition, our protocol does not require adirect quantum link between any two users, who want to communicate with each other.This may also be an appealing advantage in the implementation of a practical quantumcommunication network.