摘要
The effectiveness of a short-length message extension method based on physical chaos generator was analyzed and the entropy of the extended message was calculated in this paper.The analysis demon-strated that with the mentioned method the entropy of short-length messages,which are repeatedly used in spacecraft data systems,is obviously increased,and the security of transmission is enhanced as well.This paper also presented an improvement of the protocol for secret key agreement presented by M.J.Gander and U.M.Maurer.Instead of depending on characteristics of communication channel,this method takes advantage of the random data produced by physical chaos generator to preset the initial parameters of the procedure on both sides of communication,so that the procedure and quantity of cipher key can be precisely controlled.This method can be used to cipher key management of se-cure communication between long life-span spacecraft and ground system.
The effectiveness of a short-length message extension method based on physical chaos generator was analyzed and the entropy of the extended message was calculated in this paper. The analysis demonstrated that with the mentioned method the entropy of short-length messages, which are repeatedly used in spacecraft data systems, is obviously increased, and the security of transmission is enhanced as well. This paper also presented an improvement of the protocol for secret key agreement presented by M. J. Gander and U. M. Maurer. Instead of depending on characteristics of communication channel, this method takes advantage of the random data produced by physical chaos generator to preset the initial parameters of the procedure on both sides of communication, so that the procedure and quantity of cipher key can be precisely controlled. This method can be used to cipher key management of secure communication between long life-span spacecraft and ground system.
基金
Supported by the National Hi-Tech Research and Development Program of China ("863") (Grant No. 2004AA741071)
