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Proceedings Paper

An improved quantum key distribution protocol
Author(s): Ting-wan Wu; Guo-hua Wu
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Paper Abstract

This paper presented an improved quantum key distribution protocol of the quantum cryptology. Using the same measure polarizer as BB84 protocol, the improved protocol we designed with not any classical channel, but a new looped quantum channel instead, so the job of sending and receiving can be finished only by one same person. It brings several good points: the utilization ratio of photons 100% in perfect condition, at least twice over other protocols, or even higher; the public channel easy to be attacked is avoided. Further, the improved protocol authenticates the legal communicators with pre-share information, so that no attacker can jump over the progress of authentication. Be alien from the protocol of BB84, the improved protocol uses message summary to detect whether messages intercepted by attacker. Because the message summary is encrypted by one-time-pad method using pre-share information, attacker could not alter the message summary and that not to be discovered. Moreover, some theoretical analysis to the improved protocol given with information theory: we used the measure channel concept for quantum detection, and calculated the information quantity obtained by attacker in the quantum secrecy communication. The analysis results provide the theory criterion for the legal communicators and the attackers.

Paper Details

Date Published: 3 September 2008
PDF: 7 pages
Proc. SPIE 7072, Optics and Photonics for Information Processing II, 707214 (3 September 2008); doi: 10.1117/12.796401
Show Author Affiliations
Ting-wan Wu, South China Univ. of Technology (China)
Guo-hua Wu, South China Univ. of Technology (China)
Guangdong Mobile Communication Co., Ltd. (China)

Published in SPIE Proceedings Vol. 7072:
Optics and Photonics for Information Processing II
Abdul Ahad Sami Awwal; Khan M. Iftekharuddin; Bahram Javidi, Editor(s)

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