Date Added: Sep 2011
Generally vehicles in VANETs should periodically broad-cast safety messages. Since, safety messages contain traffic related information and are sensitive to location privacy, it is essential to ensure anonymity, authenticity and traceability in broadcast. These conflicting requirements make it difficult to design a secure communication scheme for VANETs. In this paper, the authors propose a signature scheme which provides anonymous, authenticated and traceable communication based on the efficient combination of (t, n)-threshold signature and Weil Pairing. ATCS scheme aims to provide the authenticity of signed broadcasting messages to prevent internal attacks.