| Information security is undoubtedly an important direction of research in the age of information explosion with the development of WSN. During the transmission of information in the node, There are some security risks,such as tampering the privacy data. How to protect the privacy of information can be transmitted over the network without being stolen is a major challenge faced by WSN.This paper researched the privacy preservation based on data encryption for the WSN, both of the technology of encryption and non-encryption.This paper described the basics knowledges of wireless sensor networks, and the current popular technology of privacy preservation.Firstly,this paper proposed a dynamic key pre distribution scheme based on E-G algorithm for its shortcomings. The update mechanism was introduced to our scheme to ensure the security of the key and the whole network. It also guaranteed the security of the new nodes, also increased the invulnerability and connectivity rate of the random key distribution.Then based on the research of CPDA scheme, this paper proposed an improved non-encrypted privacy preservation program. The program joined the certification, the update mechanism to increase the reliability of sources of information.,also improved the security of the entire network by using the new key distribution scheme in the data exchange process.This paper alse combined the technology of e ncryption and non-encryption:the homomorphic encryption scheme which is based on ECC homomorphic systems, the methed of adding the identification and authentication mechanism before we exchange the data.This proposal combines the algorithm of SMART to ensure the encrypted information will not be leaked by the methed of information’s exchanging and mixing. this paper combines the theoretical analysis and experimental simulation, and calculate some index of WSN :connectivity, the overhead ofcommunicating, the overhead storage and so on.Compared to current methods,better privacy will be protected. |
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