程式作业利用SIM卡实现车路通讯之匿名化服务.pptVIP

匿名化服務 — 說明 Since all drivers pass through the toll booth to enter the highway, they could also authenticate themselves to an anonymization service hosted in the booth. The toll booth provides the driver with a temporary ID (i.e., a public key pair {K, K?1}) to be used for the duration of the trip. The system could optionally make use of reanonymizers positioned at regular intervals in stoplights or mile markers to further enhance driver privacy. A reanonymizer would provide a new identity certificate to any vehicle that can prove that it already possesses a temporary identity. Each certificate will be issued with a short lifetime, so that the certificate expires shortly after a vehicle passes the next reanonymizer. This prevents an adversary from accumulating anonymous identities for use in a Sybil attack. 匿名化服務 — 說明 When a vehicle approaches a reanonymizer, the reanonymizer would broadcast a random nonce, N. The vehicle would sign the random nonce using its secret key and broadcast the signature along with its public key. After verifying the signature, the reanonymizer would broadcast a new certificate encrypted with the vehicle’s old public key. The certificate would contain the vehicle’s new identity, , a timestamp (T), and the reanonymizer’s signature. The exchange between the vehicle (V) and the reanonymizer (R): Thus, every time a vehicle passes a reanonymizer, it can acquire a new identity independent of its previous identity. The anonymization service would help secure the congestion detection application, since it would provide each vehicle with a single strong identity without compromising the vehicle’s anonymity. 實驗程式範例畫面 實驗程式範例畫面 * University of Freiburg Computer Networks and Telematics Prof. Christian Schindelhauer 程式作業：利用SIM卡實現車路通訊之匿名化服務 配合研讀論文： Bryan Parno and Adrian Perrig, “Challenges in Securing Vehicular Networks”, HotNets-IV 2005 * 預備工作：車路通訊的基本模擬 (1/2) 實作UDP client/server程式，模擬一車輛行駛某一路段接收到二個RSUs定期發送出的advertisement封