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Progress in Natural Science Materials International

Measuring-basis-encrypted six-state quantum key distribution scheme*

Chen Pan, Deng Fuguo, Pingxiao Wang, Long Guilu

Published Jan 1, 2006• 3 citations
Publisher

Abstract

A six-state quantum key distribution scheme with measuring-basis encryption technique, which is based on the six-state protocol and the MBE protocol, is proposed. In this modified six-state quantum key distribution protocol, Alice and Bob use a control key to synchronize the use of their measuring-basis so that they always use the same measuring-basis. This modified six-state quantum key distribution protocol retains the advantage of higher security and at the same time has a higher efficiency.

DOI
10.1080/10020070612331343196

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A six-state quantum key distribution scheme with measuring-basis encryption technique, which is based on the six-state protocol and the MBE protocol, is proposed. In this modified six-state quantum key distribution protocol, Alice and Bob use a control key to synchronize the use of their measuring-basis so that they always use the same measuring-basis. This modified six-state quantum key distribution protocol retains the advantage of higher security and at the same time has a higher efficiency.
Recently, Boyer et al. presented a novel semiquantum key distribution protocol [ Phys. Rev. Lett. 99 (2007) 140501 ] by using four quantum states, each of which is randomly prepared in the Z or X basis. Here we present a semi-quantum key distribution protocol by using maximally entangled states in which quantum Alice shares a secret key with classical Bob. Quantum Alice has the ability to prepare Bell states and perform Bell basis or computational basis measurement. Classical Bob is restricted to measuring, preparing a particle in the computational basis, reflecting or reordering the particles. The qubit efficiency of the protocol improves to 50% and the protocol can be modified to a measure-resend protocol or a protocol without quantum memory. We also show that the protocol is secure against eavesdropping.
In view of the limitations of existing image encryption technique and high security of quantum key distribution scheme, an image encryption algorithm based on six-state quantum key distribution scheme is proposed. On the basis of two groups of conjugate bases of four states scheme(BB84 protocol), another pair of rotating measuring bases are introduced to constitute six state base space; random binary key strings are generated with six-state scheme, then the key strings and image data are operated with XOR, and image data are replaced with the operation results. Experimental results and security analysis show that with the new algorithm key space increased, the brute force attack can be resisted; with lower relevancy of plaintext and cipher text, the chosenplaintext attack can be effectively resisted; the algorithm achieves better sensitivity and security.
A quantum key distribution protocol, based on the quantum dense encoding in entangled states, is presented. In this protocol, we introduce an encoding process to encode,two classical bits information into one of the four one-qubit unitary operations implemented by Alice and the Bell states measurement implemented by Bob in stead of direct measuring the previously shared Einstein-Podolsky-Rosen pairs by both of the distant parties, Alice and Bob Considering the practical application we can get the conclusion that our protocol has some advantages. It not only simplifies the measurement which may induce potential errors, but also improves the effectively transmitted rate of the generated qubits by the raw key. Here we also discuss eavesdropping attacks against the scheme and the channel loss.