Research Of The Encryption And Signature In Wireless Sensor Network

Cryptograph can ensure the integrity and non-repudiation of information not only provide the confidentiality, also it can prevent the tampering and forgery of information. The electronic signature plays a more and more important role as the rapid development of the computes and computer networks. The real life needs increasing new requirements for this technology.Aimed at the authentication problems of data and nodes in wireless sensor networks (WSNs), based on the Shamir's identity authentication. These methods focus on the data integrity and non-repudiation for authentication in communications. In the concrete implementation methods, we must give full consideration to the special nature of the WSNs, such as single-user computing nodes, storage capacity as well as the broadcast and multicast communications in WSNs. And strive to insure signing mechanism is simple and effective. The main contributions of this thesis are as follows:First, the thesis proposes a signcryption scheme based on IBE and compares it with Malone-lee's scheme. We transfer mainly computation of bilinear maps to the sender. Therefore, it is more suitable for the recipient network for resource-constrained. Further, we prove its security under the existing security model for signcryption.DIBE is a new type of Identity-Based Encryption (IBE) scheme which can be applied to a distributed system. The DIBE scheme has the properties of scalability and adaptability, which can solve the problem that the different systems using the IBE mechanism encryption must share the same master key. This thesis describes the algorithms and analyzes its security and performance, including the complexity and the security. Some simulation results demonstrate the performance of the DIBE by using the PBC function packet.The multicast schemes based on DIBE can apply in a distributed system. Its subsystems with the same parameters and the different master keys can multicast communication with each other. And we give two kinds of broadcast communication schemes based on DIBE.