行動商務的代理人英式拍賣機制之研究

Abstract

由於網路科技的迅速發展以及個人行動電話普遍化的趨勢，使得以行動裝置進行網路拍賣的商機需求，具有相當可期的潛力，因此，在滿足行動裝置需求與限制的條件下，本論文將行動代理人技術與英式拍賣機制的運作予以整合，使競標者透過代理人的方式參與拍賣與競標，並使用英式拍賣機制建置網路拍賣環境，以提供使用者一個安全、公平及有效率的網路拍賣環境。在此機制之下，包含四個參與者，包括註冊單位、代理人管理者、拍賣所管理者、競標者，註冊單位負責註冊與驗證競標者的身分；代理人管理者負責管理或控制所有相關的代理人與核發交易公開金鑰給競標者；拍賣所管理者負責提供拍賣的場所，並維護與主持整個拍賣的運作；競標者則是參與拍賣與出價的買方。該機制符合電子拍賣協定中的安全性：匿名性、可追蹤性、不可陷害性、不可偽造性、不可否認性、公平性、可公開驗證性、在不同拍賣中無關聯性、同一拍賣中有關聯性、投標有效率、單次註冊、容易註銷。同時，為了因應網路環境，需考量競標資訊傳遞過程所耗損的時間成本，因此，本論文以佈告欄的方式供各個管理者公佈競標資訊，並應用橢圓曲線密碼系統，利用其短金鑰、低運算量等特性，力求提升產生金鑰與出價的速度、驗證的效率，並且減少行動裝置的計算量與伺服器的負載量，從而增進網路拍賣系統的便利性。

Rapid development of the Internet and the extensive use of mobile phones have led to increased potentiality for the application of mobile devices in online auctions. Keeping the needs and constraints of mobile devices in mind, this paper proposes a secure, fair, and effective online auction environment based on the English Auction protocol by integrating its operation with mobile agent technology that allows bidders to participate in online auctions through mobile agents. The protocol consists of four participants: Registration Manager, Agent House, Auction House, and Bidder. The Registration Manager is responsible for Bidders’ identity registration and verification. The Agent House manages and controls all related agents and assigns the public transaction keys to Bidders. The Auction House provides a place for auction, and maintains and hosts all necessary operations for an online auction to be taken place. The Bidder can be defined as the buyer who is interested in purchasing items from the auction. The proposed scheme conforms the following security characteristics which satisfying the requirements of an online auction protocol: anonymity, traceability, non-framing, unforgeability, non-repudiation, fairness, public verifiability, unlinkability among various auction rounds, linkability within a single auction round, bidding efficiency, one-time registration, and easy revocation. Given the complex nature of the Internet environment, the consideration is also given to time costs of bidders’ data transmission. Thus, this paper makes use of the bulletin board approach for managers to publish the bidding information. Application of Elliptic Curve Cryptosystem for its small key size and low computation amount is exploited to improve the speed of key generation and bidding, and verification efficiency. By cutting down on computation cost for mobile devices and load volumes on the part of servers, convenience of conducting online auctions is enhanced as well.