Recently, security concerns to automobiles are rapidly increasing. When threats are found in a vehicular system, this may usually take time to acquire adequate countermeasures. Threats to a vehicle can be classified into three categories: theft of in-vehicle devices, penetration into the internal network and utilization of the external network. This paper surveys threats in each category and their countermeasures. Among these threats, an anti-theft system is researched, which tries to prevent theft of in-vehicle devices. According to a survey, the existing anti-theft system is still vulnerable and hence in-vehicle devices do not ensure safety and reliability. Therefore, this paper also proposes an enhanced anti-theft system and analyzes its security and feasibility. This study is expected to show a reference of a configuration for more enhanced anti-theft systems for in-vehicle devices.

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