Browsing by Author "Chung, Yu-Fang"

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Access Scheme for Controlling Mobile Agents and its Application to Share Medical Information
(2016-05)
Liao, Yu-Ting
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Chen, Tzer-Shyong
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Chen, Tzer-Long
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Chung, Yu-Fang
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Chen, Yu-Xin
This study is showing the advantage of mobile agents to conquer heterogeneous system environments and contribute to a virtual integrated sharing system. Mobile agents will collect medical information from each medical institution as a method to achieve the medical purpose of data sharing. Besides, this research also provides an access control and key management mechanism by adopting Public key cryptography and Lagrange interpolation. The safety analysis of the system is based on a network attacker\'s perspective. The achievement of this study tries to improve the medical quality, prevent wasting medical resources and make medical resources access to appropriate configuration.
An Agent-Based Auction Protocol on Mobile Devices
(2014)
Chung, Yu-Fang
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Chen, Tzer-Long
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Chen, Tzer-Shyong
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Chiang, Dai-Lun
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Chen, Yu-Ting
This paper proposes an English auction protocol to preserve a secure, fair, and effective online auction environment, where the operations are integrated with mobile agent technology for bidders participating in online auctions. The protocol consists of four participants, namely, registration manager, agent house, auction house, and bidder.
An agent-based English auction protocol using Elliptic Curve Cryptosystem for mobile commerce
(2011-08-01)
Chung, Yu-Fang
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Chen, Yu-Ting
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Chen, Tzer-Long
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Chen, Tzer-Shyong
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資訊工程學系
Rapid development of the Internet and the extensive use of mobile phones have increased demand for mobile devices in Internet auctions. This trend is acting as an incentive to develop an auction model for mobile-based environment. Recently, Kuo-Hsuan Huang proposed a mobile auction agent model (MoAAM), which allows the bidders to participate in online auctions through a mobile agent. He used modular exponentiation operations in his method. As a result, the processing time for key generation, bidding, and verification were long. Thus, we propose to add the concept of Elliptic Curve Cryptosystem (ECC) onto MoAAM, because ECC has low computation amount and small key size, both of which will aid to increase the speed in generating keys, bidding, and verification. In terms of reduction of computation load on mobile devices and auction-manager server, the proposed method will make online auction system more efficient as well as more convenient to use. This paper mainly uses the English auction protocol as the key auction protocol. The protocol consists of four entities: Registration Manager (RM), Agent House (AH), Auction House (AUH), and Bidders (B). The Registration Manager registers and verifies Bidder identity. The Agent House manages the agents and assigns public transaction keys to Bidders. The Auction House provides a place for auction and maintains all necessary operations for a smooth online auction. Bidders are buyers who are interested in purchasing items at the auction. Our proposed method conforms to the requirements of an online auction protocol in terms of anonymity, traceability, no framing, unforgetability, non-repudiation, fairness, public verifiability, unlinkability among various auction rounds, linkability within a single auction round, efficiency of bidding, one-time registration, and easy revocation. (C) 2011 Elsevier Ltd. All rights reserved.
An Agent-Based English Auction Protocol Using Elliptic Curve Cryptosystem for Mobile Commerce
(2009)
Chung, Yu-Fang
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Chen, Tzer-Shyong
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Chen, Yu-Ting
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Lee, Chiu-Chan
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Wang, Szu-Wen
With the rapid development of Internet and the extensive Use of mobile phones, the demand for the use of mobile devices in Internet auctions has increased. Because of this trend, there is an incentive to develop an auction model that is to be used on a mobile-based environment. Recently, Kuo-Hsuan Huang proposed a mobile auction agent model (MoAAM), which allows the bidders to participate in online auctions through a mobile agent. Huang used modular exponentiation operations in his method; however, it would increase the processing time for key generation, bidding, and verification. Thus, we propose to add the concept of Elliptic Curve Cryptosystem (ECC) onto MoAAM, because ECC is able to provide low computation amount and small key size. It would aid to increase the speed in generating keys, bidding, and verification. In terms of reduction of computation load on mobile devices and auction-manager server load, the proposed method will make online auction system become more convenient for users. This paper mainly uses the English auction protocol as the key auction protocol. The protocol consists of four entities: Registration Manager, Agent House, Auction House and Bidder. Especially, our proposed method conforms to the requirements of an online auction protocol, like anonymity, public verifiability, one-time registration, etc.