Research And Application Of Broadcast Signcryption Algorithm

With the development of mobile communication technology and the popularity of portable network equipment,kinds of communication business application such as pay TV,multimedia protection,and secure email was more and more widely,a lot of digital content need the secure channel.In order to ensure the security of these information,the paper mainly studied the design of efficient and secure broadcast signcryption scheme and its application in mobile Ad hoc network,main work is as follows:(1)This paper had a research on now existing identity_based broadcast signcryption.According to the characteristics of the Selvi's scheme,whose scheme has the shortage of efficiency,we constructed an identity_based broadcast signcryption with high efficiency.Our scheme simplified parts of broadcast parameters,improved the process of designcryption and reduced the space complexity of the algorithm.Our sheme had the advantage of high efficiency and could ensure the security of the information.(2)This paper analyzed now proposed certificateless broadcast signcryption and proposed a certificateless broadcast signcryption scheme with high efficiency.When performing signcryption,the users without using bilinear pair computation,and performing designcryption,the users without using hash function,all algorithm only have five bilinear pair computation.What's more,this paper gave the complete resist public key replacement formal security model about certificateless broadcast signcryption.In the standard model,the paper proved the message is unforgetable and the ciphertext is indistinguishable with the chosen ciphertext attack.(3)According to the characteristics of Ad hoc network,this paper designed a broadcast signcryption scheme to guarantee the secure communication of the mobile Ad hoc network.This scheme mainly considered the multi-frequency hierarchical structure of the mobile topology in mobile Ad hoc networks,and introduced a cluster-type security system suitable for Ad hoc networks,and based on the key update process held by the nodes in each node transformation process,this paper illustrated the practical significance of using the broadcast signcryption algorithm for mobile Ad hoc network security system.