A New Quantum Secure Direct Communication Scheme with Authentication

Arindam Dutta, Anirban Pathak

Zu-Ning Chen, Zheng Qin, Lei Lu

Dan Liu, Changxing Pei, Dongxiao Quan +1 more

A new quantum secure direct communication (QSDC) scheme with authentication is proposed based on polarized photons and EPR pairs. EPR pairs are used to transmit information, while polarized photons are used to detect Eve and their encoding bases are used to transmit authentication information. Alice and Bob have their own identity number which is shared by legal users only. The identity number is encoded on the bases of polarized photons and distilled if there is no Eve. Compared with other QSDC schemes with authentication, this new scheme is considerably easier and less expensive to implement in a practical setting.

Minjie Wang, Wei Pan

We propose two schemes of quantum secure direct communication (QSDC) combined ideas of user authentication [Phys. Rev. A 73 (2006) 042305] and direct communication with dense coding [Phys. Rev. A. 68 (2003) 042317]. In these protocols, the privacy of authentication keys and the properties of the EPR pairs not only ensure the realization of identity authentication but also further improve the security of communication, and no secret messages are leaked even if the messages were broken.

Lu Yin-Ju

Song Wang, Yuanzhi Li, Jinhui Ma +3 more