The advent of intelligent transportation system has a crucial impact on the traffic safety and efficiency. To cope with security issues\nsuch as spoofing attack and forgery attack, many authentication schemes for vehicular ad hoc networks (VANETs) have been\ndeveloped, which are based on the hypothesis that secret keys are kept perfectly secure. However, key exposure is inevitable on\naccount of the openness of VANETenvironment. To address this problem, key insulation is introduced in our proposed scheme.\nWith a helper device, vehicles could periodically update their own secret keys. In this way, the forward and backward secrecy has\nbeen achieved. In addition, the elliptic curve operations have been integrated to improve the performance. The random oracle\nmodel is adopted to prove the security of the proposed scheme, and the experiment has been conducted to demonstrate the\ncomparison between our scheme and the existing similar schemes.
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