A Research Into Mixed Cryptography Based On AIE Scheme And Its Application For 3G Communication System

With the development of telecommunication network technology,especially the 3G network system,the security of telecommunication has been paid more and more attention. And in many countries,cryptography,with which we can assure the security of telecommunication,is an efficient and widely used method.However,due to many differences between wireless environment and conventional lineate environment,it has more restricts,for example,the more narrow network bandwidth,the greater transmission delay time,the lower memory capacity and electrontic power.As a result,many security schemes in lineate environment are not suitable for wireless environment,it is essential to develop a usefull cryptography scheme that can be used in wirless environment.Based on the ananlysis of the cryptography scheme in the original paper(Claude Castelluccia),we propose a new scheme by introducing public key cryptography,with which we can solve the disadvantages of the original paper:one is too large number of keys of dynamic sets to be shared and the other is the hardness to implement two network nodes(one node and its next neighbour's direct neighbour node) to share a key.And we implement a 3G communication system antetype about that.Compared with other system,it improves the security,for it's secure against passive attacks,active attacks and replay attacks.Through careful analysis,we can find that our cryptography scheme is an efficient method for supporting global mobility with low computational loads and secure communication.