Research On Privacy Protection Technology And Security Protocols In Vanets

Vehicle Ad-hoc Networks(VANETs) can offer a wide range ofservices which can create safer, more well-organized, more intelligent roadcondition for drivers. However, Security and privacy issues in VANETsshould not be ignored just as that in wired network, and lack of suchsecurity and privacy in VANETs is one of the key hindrances to the widespread implementations of it. Due to the specificity of the networkarchitecture and the communication peers, communication data such asvehicle location and license plate number can reveal the driver’s identity,travel route or other sensitive personal information. So privacy protectionis particularly important in VANETs, and designing secure protocols thatcan meet the security requirements of special scenes is a extremelychallenging task.The thesis summarizes several common methods to achieveprivacy-preserving communication in VANETs, and introduces sometypical works of these methods in terms of system model, protocolframework, advantage and disadvantage. On the basis research of theanonymous authentication technologies above, it proposes severalconditional privacy-preserving and secure authentication schemes orapplication protocols. The main work of this thesis is as follows:1. It proposes a privacy-preserving and secure message authenticationframework based on group signatures and gives a concrete scheme. Thescheme employs a re-randomizable signature schemes to hide the signedmessage so as to preserve the anomymity of the signer, rather than usingstandard encryption. It associates living time with signing keys to achievemember revocation. The batch technique is used to reduce the verification cost. Security analysis and extensive simulations illustrate that the schemeis adequate for VANET in terms of security and efficiency.2. Taxi hailing using a smart phone is an application of VANETs, butsome security issues in it were ignored in the past. This thesis analyzes thesecurity risks existing in taxi hailing using mobile phone applications, anddesigns a privacy-preserving and secure taxi hailing protocol by using theattribute-based encryption and self-certified signature. Security analysisand simulation results show that the protocol can deal with these securityproblems without affecting the efficiency.3. Vehicle navigation is a representative commercial comfortabledriving related application in VANETs. This thesis proposes a newprivacy-preserving and secure navigation protocol which is built on aunified authentication platform. A vehicle and the RSU nearby establish acommon session key with the help of the authentication server. The vehiclesigns the bill which is a hash value of the request message using groupsignature to protect its destination as well as to show the authenticity of thenavigation query. RSUs issue tickets for the vehicle to make relaynavigation successful. Security analysis shows that the protocol can satisfyall the security requirements of the system. Performance evaluation showsthat the protocol proposed is suitable to the VANET environment in termsof cost of computing, storage and communication overheads.