• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1333-1336
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• 2003

IMT-2000 상용화를 눈앞에 둔 시점에서 다양한 모바일 서비스들이 성장세를 보임에 따라 무선 인터넷 환경에서의 보안 문제가 큰 이슈로 대두되고 있다. 본 논문에서는 무선 인터넷상의 Data 전송에 쓰이는 보안 솔루션(WAP, ME, 1-Mode)을 비교 분석하며, End-To-End Security 문제를 해결할 수 있는 플렛폼을 제시한다. 제안된 모바일 인증 플렛폼은 표준화된 암호화 패킷을 사용함으로써 보다 높은 보안 수준을 제공하고 기존의 WAP의 WAP Gateway에서의 평문의 내용 유출을 막음으로서, 안전한 모바일 환경을 제공할 수 있는 가능성을 제시한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.8
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• pp.1732-1742
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• 2003

WPP protocol based a Credit card payment in mobile Internet uses WTLS which is security protocol of WAP. WTLS can't provide End­to­End security in network. In this paper, we propose a protocol both independent in mobile Internet platform and allow a security between user and VASP using Mobile Gateway in AIP. In particular, our proposed protocol is suitable in mobile Internet, since session key for authentication and initial payment process is generated using Weil Diffie­Hellman key exchange method that use additive group algorithm on elliptic curve.

• Proceedings of the IEEK Conference
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• 2001.06a
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• pp.141-144
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• 2001

This paper has been studied a implementation of HTML Filter with structured decks. In wireless environment, conventional HTML Filter converts HTML document to WML by once. However, it is more efficient to access a WEB site by transmitting the minimal capacity of core data in WAP environment. Therefore this paper suggests new HTML Filter that automatically analyze the contents of HTML WEB and transmits it by selecting the one of many Decks that have the structured architecture. Also the protocol between wireless terminal and WAP Gateway is considered. Finally, We test the proposed HTML Filter with structured Decks for some particular web site.

• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.391-393
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• 2001

본 논문은 WAP Gateway의 HTML Filter 구현에 대하여 다루고 있다. 웹 콘텐츠를 무선환경에 맞는 WML 문서로 변환하기 위한 HTML Filter 구조를 설계하고 이와 관련된 RuleSet Database, Parsing Engine, Markup Language Translator의 기능을 정의한다. 마지막으로, 확장성 있는 웹 서비스를 위해 실제 웹상의 콘텐츠를 대상으로 한 실험으로 통해 구현된 HTML Filter의 성능 평가의 분석을 수행하여 구현시 고려해야 할 사항 및 향후 연구방향에 대하여 논의한다.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.2
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• pp.165-182
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• 2001

In this paper, we describe a design and implementation of the Wireless Markup Language(WML) compiler to deploy wireless Internet services effectively. The WML compiler translates textual WML decks into binary ones in order to reduce the traffic on wireless links that have relatively low bandwidth to wireline links and mitigate the processing overhead of WML decks on, wireless terminals that have relatively low processing power to fixed workstations. In addition, it takes over the overhead of eXtensible Markup Language(XML) well-formedness and validation processes. The WML compiler consists of the lexical analyzer and parser modules. The granunar for the WML parser module is LALR(1) context-free grammar that is designed based on XML 1.0 and WML 1.2 DTD(Document Type Definition) with the consideration of the Wireless Application Protocol Binary XML grammar. The grammar description is converted into a C program to parse that grammar by using parser generator. Even though the tags in WML will be extended or WML DTD will be upgraded, this approach has the advantage of flexibility because the program is generated by modifying just the changed parts. We have verified the functionality of the WML compiler by using a WML decompiler in the public domain and by using the Nokia WAP Toolkit as a WAP client. To measurethe compressibility gain of the WML compiler, we have tested a large number of textual WML decks and obtained a maximum 85 %. As the effect of compression is reduced when the portion of general textual strings increases relative to one of the tags and attributes in a WML deck, an extended encoding method might be needed for specific applications such as compiling of the WML decks to which the Hyper Text Markup Language document is translated dynamically.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06d
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• pp.238-240
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• 2006

현재 RFID 네트워크의 구조적 기준이 되는 EPC 네트워크는 HTTP/SOAP 통신 프로토콜과 HTML/XML을 이용하여 서비스를 제공한다. 반면 모바일 RFID 네트워크에서는 휴대 단말기의 특성에 따라 WAP방식 및 HTTP방식으로 서비스가 제공되고 있지만 단말기의 제약으로 인해 다양한 서비스 이용이 불가능 하다. 이와 같은 차이점으로 인해, 같은 RFID 네트워크 임에도 달구하고 논리적으로 두 개의 네트워크로 구분되며 서비스의 상호연동이 불가능 하다. 본 논문에서는 기존의 EPC 네트워크 구성을 따르며 모바일 RFID 네트워크의 구조변경없이 두 네트워크 간의 서비스 연동을 위한 구성 요소인 Application Server(AS)와 Mobile RFID Application Level Gateway(mRFID-ALG)를 제시한다.

• Proceedings of the IEEK Conference
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• 2000.06a
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• pp.105-108
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• 2000

The number of cellular phone users has exceeded over twenty million recently. Some researches show that people in the twenties to thirtieth usually regard the cellular as an instrument for not only call but also Internet. It means the cellular is being highlighted as a mediator for transmitting information. Therfore it'll play an essential role soon as a gateway for unifying wire and wireless services if we can browse Internet sites, for example our own homepage or commercial site, with the cellular. This paper explain WAP topology which enable the mobile terminal to access to the Web and show a method of designing and realizing WML document on the Web.

• The Journal of Society for e-Business Studies
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• v.7 no.1
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• pp.35-50
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• 2002

Recently, payment method is one of the most hot issues for transaction of contents in mobile and internet markets. Many kinds of mobile contents services are rapidly growing with the combination of internet application services. Payment method algorithms are demanded for the stable transaction between producer and consumer. Security protocol algorithms are widely adapted for mobile Platform terminals. In this Paper, we described security mechanism for the current wireless internet services and compared with the performance result. There are security protocols that based on java machine platform or WAP protocols. The system is based on J2ME technology for the java mobile platform. Based on this technology, a security system is proposed for the service of mobile commerce electronic payment. The system is designed for the stability of transaction so that it enables to apply into many kinds of internet payment system.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.691-694
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• 2000

This paper is addressed to Internet telephony based service implementation. It describes an implementation method which uses ARS as a gateway which combines Internet and traditional public switched telephone network for Internet information service using telephony and fax, is different to traditional Internet telephony which provide enhanced speech quality and low cost functionality. This method allows telephony and/or fax user to get Internet information without additional Internet bill, Internet infrastructure and low connection quality from low signal bandwidth connected him. Implemented system is useful to a special kind information service such as climate information of Korea etc and simpler than WAP based service as for wireless mobile telephony user. We implement job opportunity information and advertisement service supported by Home page of Choong Book Small & Medium Business Administration and e-mail service supported by Korean Society for Rehabilitation of persons with Disabilities to demonstrate the system ability. As a result of test implementation, this service system works good fur blind persons and graduated persons without job, is expected to apply for special Internet information provider via Voice and Fax.

• The KIPS Transactions:PartD
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• v.10D no.3
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• pp.559-566
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• 2003

As cell phone and PDA have been in common use recently, there is a growing tendency to utilize the mobile terminals for M-Commerce. The information security and the receipt of e-trade are very important to support reliable digital transactions in wireless environment as in wired environment. Even though some work such as WML digital signature and WPKI has been studied for M-Commerce, there are several problems on the aspects of the functional limitation of the mobile terminals and the unsecure data transformation of WAP gateway. In this study we have designed and implemented a prototype system of issuing and verifying the electronic receipt that guarantees authentication, data integrity and non-repudiation for secure mobile e-commerce. Moreover, we have enhanced the system performance by letting the trusted independent server verify and manage the electronic receipt.