Research On Privacy-Preserving Access Control Protocol In Wireless Sensor Networks

Wireless Sensor network (WSN) is the basis network of the Internet of things, which has a broad application prospect and is also a hot research topic in scientific research fields. There are many studies about the distributed access control module in wireless sensor networks allowing the network to authorize and grant user access privileges for in-network date access, but little attention has been paid to protect user’s identity privacy. For the single-owner multi-user wireless sensor networks, the owner and the users may be different entity, therefore a user wants to hide his data access privacy, such as identity, access area, to other users even including the owner, which necessitates privacy-preserving access control. Studying and designing the user privacy-preserving access control protocol in WSN is of great significance to the large-scale application of WSN. However, the distributed, vulnerable, resource-constrained characteristics of wireless sensor network make privacy-preserving access control technology facing huge challenges.In large-scale single-owner multi-user wireless sensor networks, on the one hand, for the sake of safety, when a user wanting to access data the node collected using equipment such as mobile phones, PDA and laptops, the owner need to implement the strict access control to the user, which indicates only registered, verified and paid user can access data nodes collected. On the other hand, for single-owner multi-user wireless sensor networks, there is need to implement the user privacy-preserving access control, in other words, the user does not want his identity information, specific access pattern and other private information leaked to owner and other users. To study these problems, we consider combining access control thought and relevant privacy protection technology to design the privacy-preserving access control scheme.This thesis mainly focuses on privacy-preserving access control problem in WSN, which involves the privacy-preserving technologies such as:Socialist Millionaires’Problem in Secure Multi-party Computation, Attribute-Based Signatures. The main research contributions are as follows:(1) In this thesis, we introduce and summarize the existing access control model in WSN. We also introduce the developments of Socialist Millionaires’Problem; The privacy-preserving access control protocol for WSN in the third chapter in this thesis is based on an efficient attribute-based signature scheme(ABS), therefore this thesis introduces research overview of ABS.(2) The detailed introduction and analysis of the classic solution to privacy-preserving access control problem in WSN is also given in this thesis. In consideration of the advantages of ABS, we propose a privacy-preserving access control scheme based on efficient ABS, the scheme supports the pay access of users, fine-grained access and privacy protection for users. The comparison and analysis indicates that the scheme can well satisfy the requirements for privacy-preserving access control in wireless sensor network.(3) As a kind of privacy protection technology, Secure Multi-party Computation (SMC) is one of the current research hot spot. This thesis also studied the Socialist Millionaires’ Problem in SMC, SMP Socialist millionaires’ problem(SMP) is the problem of two millionaires wanting to know whether they happen to be equally rich, whose solutions can be used as the basic protocol for identity authentication, online auction and other application systems. We propose a new encoding scheme to encode private data, and then basing on the encoding scheme and the ElGamal homomorphic encryption algorithm, we design a new solution to for the socialist millionaires’problem. The validity, security and efficiency are analyzed. Finally, the comparison of protocols indicates that our scheme has high efficiency.