在隨意網路中，車載隨意網路是屬於行動隨意網路的延伸，沿襲下來有許多不同的攻擊，
所以車載隨意網路的安全是非常重要的議題，
以往的車載行動網路總是假設存在有路邊設施或第三方的協助下，用來保護傳輸環境的安全，
但是這樣假設並非合理與妥善，因此，本論文提出不需要第三方協助的安全機制，
透過建立車與車之間的信任模型與車與車之間的註冊機制，及改善驗證的方法，
來提升車載網路的安全和減緩造成的延遲問題，並達到相對的安全性，最後，在安全分析與模擬方面，
本論文的機制與比較對象TMSMBM相較，在安全性、效能及延遲方面，皆都有較好的表現。

In ad hoc network, VANET is part of MANET, and inherit it many attacks.
This make the securtiy issue, in particular, very important in VANET.
In the past, secure mechanism for VANET always designed under the assumption that road side unit or
a third party using to protect the transmission security. Since this assumption is not reasonable,
a secure mechanism without the third party is the proposed in this thesis. Our proposed is composed of
registered between car and car, building trusted model between car and car and improved verification delay
problem. To increase VANET security and to reduce the delay time, then to reach the relative security.
Finially, this papaer compared with TMSMBM. According the analysis and simulation results,
a better performance on security, efficiency, and delay time.

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