| Fieldbus is the hottest automation technology today which has been used in all kinds fields, such as building automation, intelligent region, traffic transport, industrial controlling. The technology of Smart Card has been widely applied in the intelligent region. So it is very significant to make some researches on how to integrate the LON fieldbus and Smart Card into a cheapness, higher degree of automation, higher security and credibility system.In this paper, the concept of intelligent region and the technology of LON fieldbus is generally introduced , and also analysed and prospected the application of LON fieldbus in intelligent region. After synoptically introduced the physical structure of Smart Card , the using of the chip AT89SC168 and structure on file and data of Smart Card is especially introduced. After particularly researched the cryptogram algorithm of DES,RSA,ECC,with which the virtue and shortcoming of performance in practice using is analysed. Through which a hybrid ecryptogram system based on the DES and ECC is designed, and also the flow of this cryptogram is provided. With this cryptogram, the problems of conservation of key and velocity of operation which aroses from using DES,RSA algorithm singly is it resolved,and the securities of the system is improved. Then a draft is given .With this draft, the problems of various products of region and the system structure unmatching is resolved ,and the security of system is improved by using the mix cryptogram . At last based on the LON fieldbus and Smart Card thechnology, a system of automatic charge park and door manage system is designed .The structure of network, hardware, software is particularly designed and security measure of system is given. This system has the characteristic of information synthesis and many excellences ,such as higher automatic degree, steady performance and altitudinal security. With this system,the demand of security, comfort and convenience is achieved in intelligent region. |
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