智慧型運輸系統(Intelligent Transportation Systems, ITS)之技術日趨成熟，加快了車聯網(Internet of Vehicles, IoV)的發展腳步。然而，隨著行動電子商務爆炸性的成長，車聯網也成為了下一代行動電子商務運用場景的淺力之星，如何於車聯網環境中推播產品廣告及刺激消費買氣便成了一個有趣的議題。對於商家來說，一個有效率的推銷產品方法便是透過廣告投放來吸引消費者目光，若是這個廣告投放的方式具有獎勵制度，那麼便能吸引人加入推播的行列，進而得到更多廣告曝光的機會。由於車聯網中所有的獎勵兌換皆為電子化，故如何確保憑單(Voucher)不會被有心人士非法的複製及重複利用，便為車聯網應用中一個很重要的課題。在本研究中，我們提出了一個廣告配送安全獎勵機制，該機制會給予幫忙轉傳廣告的駕駛者相對應之憑單，再藉由這些憑攤來兌換相符之獎勵。本機制除了能夠保護訊息傳輸之安全性，還能避免有心人士之共謀行為發生，進而換取原本就不屬於自己的獎勵。另外，投放廣告的公司還能根據本機制所設計之機制來得知廣告投放成本效益如何。最後，安全性分析能說明本機制之設計所能防範之常見攻擊。

Technologies for intelligent transportation systems built on Internet of Vehicles (IoV) networks are getting mature in the past couple of years. Along with the bursting demand and success of mobile commerce all over the world in recent years, how to utilize IoV networks to promote products and sales has become an interesting topic for next-generation mobile commerce. One of the most cost-saving, effective and efficient ways for sales promotion is to adopt the tactics of electronic advertisement dissemination with voucher incentives in IoV environments. Since all vouchers will be given in digital format within IoV, how to make sure that illegal copies of digital vouchers cannot be redeemed by malicious voucher receivers (vehicle drivers) is a critical requirement for voucher dissemination mechanisms. In this paper, a new secure voucher dissemination mechanism is introduced to give incentives among vehicle drivers to forward electronic advertisements they received to other vehicles. Our mechanism provides secure advertisement and voucher transmission in IoV environments. In addition, the proposed mechanism can prevent vehicle drivers from redeeming false vouchers or getting extra vouchers through collusion among vehicle drivers. Our mechanism also embeds cost control scheme inside for advertisers. Security analysis is conducted to evaluate the security strength of the proposed mechanism.

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