• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.193-196
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• 2000

A new medium access control protocol is proposed to support stable wireless Internet services. Using the characteristics of the uplink Internet traffic and a Voice-Packet multi-session mode, the proposed protocol transmits the uplink Internet traffic via the voice traffic channel of silent duration in a multi-session mode. Out simulation results show that the proposed protocol guarantees stable wireless Internet services under heavy loads.

• Journal of Advanced Marine Engineering and Technology
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• 제27권1호
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• pp.65-75
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• 2003

The internet telephony service is one of the successful internet application services. VoIP is the key technology for the service to come true. VoIP uses H.323 or SIP as the standard protocol for the distributed multimedia services over the internet environment, in which QoS is not guaranteed. VoIP carries the packetized voice by using the RTP/UDP/IP protocol stack. The UDP-based internet services cause the data transmission problem to the users behind the internet firewall. So does the internet telephony service. The users are not able to listen the voices of the counter-parts on the public internet or PSTN. It makes the problem more difficult that the internet telephony service addressed in this paper uses only one UDP port number to send the voice data of all sessions from gateway to terminal node. In this paper, two schemes including the usage of dummy UDP datagrams, and the protocol conversion are suggested. The implementation of one of the schemes, the protocol conversion, and the performance evaluation are described in detail.

• 지식정보인프라
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• 통권9호
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• pp.52-59
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• 2002

현재 우리가 사용하고 있는 Internet Protocol인 TCP/IP(Transmission Control Protocol/Internet Protocol)중 어드레스 IPv4 10진수 체계가 16진수 체계로 변화된 것이 바로 IPv6 Address이다. IPv6 Address특징으로서는 기하 급수적으로 늘어나는 Internet Address를 감당해낼 수 있고, Multi-Media Data 처리가 능숙한 데다 보안성까지 갖추고 있어 앞으로 이용에 대한 장래성이 기대되는 프로토콜이다.

• 디지털산업정보학회논문지
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• 제15권1호
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• pp.21-28
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• 2019

Internet of Things(IoT) is a technology or environment that collects data by attaching sensors to objects and transmits the collected information to each other through wired / wireless communication in real time. It is expected that when the Internet of objects is activated, many objects can identify and recognize each other by themselves and provide various services to facilitate our lives through mutual information exchange. In addition, the internet market for things is growing rapidly each year, and various IT technologies are expected to converge. In the Internet environment of objects, data exchange technology between object devices, that is, message protocol, is classified as one of important technologies. In this paper, we examine various lightweight message protocols suitable for the Internet environment of objects, and compare the reliability of the CoAP protocol structure with the MQTT protocol for a limited environment. Finally, we confirm the reliability of TCP / TLS and WebSockets-based CoAP transmission protocol of IETF's CoRE WG that can use various transport layers other than UDP in Internet environment including cloud infrastructure.

• 한국인터넷방송통신학회논문지
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• 제14권4호
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• pp.7-12
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• 2014

IETF (Internet Engineering Task Force)의 CoAP (Constrained Application Protocol) 프로토콜은 작은 용량의 메모리와 저전력 등 제한된 환경에서 센서나 구동체 노드 간에 통신을 지원한다. CoAP 프로토콜은 HTTP와 쉽게 상호 변환할 수 있으며, 사물인터넷(Internet of Thing : IoT)와 M2M (Machine-to-Machine) 환경에서 저전력 센서와 구동체 네트워크를 통한 기반 시설을 감시하거나 관리할 수 있다. IETF CoRE(Constrained RESTful environments) 워킹그룹(Working Group)에서 2010년에 CoAP 프로토콜에 대한 표준화를 시작하여 최근에 RFC(Request for Comments) 7252로 발표한다 [2]. 본 논문에서는 이질적인 운영 환경에서 CoAP 프로토콜을 설계하고 구현하여 상호 호환성을 검증한다. 이를 위해 CoAP 클라이언트에는 윈도우 기반의 CoAP 프로토콜을 실현하고, CoAP 서버에는 리눅스 기반의 CoAP 프로토콜을 구현하여 상호 연동 실험을 실시하여 동작을 확인한다.

• 한국콘텐츠학회논문지
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• 제5권3호
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• pp.9-17
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• 2005

최근 정보통신기술의 급속한 발달로 무선인터넷을 이용한 전자상거래 사용자가 폭발적으로 증가하고 유선에서 유/무선 통합 환경으로 변화함에 따라 보안상의 많은 문제점이 제시되고 있다. 현재 무선 전자상 거래에서 사용하는 WPP는 WAP의 무선과 유선을 연계하는 GW에서 보안 취약점이 있고 또 다른 AIP는 인중서 체인 이용으로 계산량이 많고 사용자의 신원이 노출되는 단점이 있다. 이 논문에서는 기존 AIP 프로토콜을 기반으로 하는 특수한 타원곡선인 Weil Pairing을 적용한 ID 기반 공개키 암호기법을 사용하여 거래정보의 기밀성을 보장하고 은닉전자서명 기법을 통한 인증서를 사용하여 프라이버시 보호와, 공개키와 사용자 인증 및 부인방지를 해결하였으며 또한 두 객체만 공유하는 세션키를 사용하여 종 단간 보안을 제공하는 특정 무선 플랫폼에 독립적이며 안전하고 효율적인 지불 프로토콜을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권2호
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• pp.978-1002
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• 2019

With the rapid development of the Internet of Things, the problem of privacy protection has been paid great attention. Recently, Nikooghadam et al. pointed out that Kumari et al.'s protocol can neither resist off-line guessing attack nor preserve user anonymity. Moreover, the authors also proposed an authentication supportive session initial protocol, claiming to resist various vulnerability attacks. Unfortunately, this paper proves that the authentication protocols of Kumari et al. and Nikooghadam et al. have neither the ability to preserve perfect forward secrecy nor the ability to resist key-compromise impersonation attack. In order to remedy such flaws in their protocols, we design a lightweight authentication protocol using elliptic curve cryptography. By way of informal security analysis, it is shown that the proposed protocol can both resist a variety of attacks and provide more security. Afterward, it is also proved that the protocol is resistant against active and passive attacks under Dolev-Yao model by means of Burrows-Abadi-Needham logic (BAN-Logic), and fulfills mutual authentication using Automated Validation of Internet Security Protocols and Applications (AVISPA) software. Subsequently, we compare the protocol with the related scheme in terms of computational complexity and security. The comparative analytics witness that the proposed protocol is more suitable for practical application scenarios.

• 전자통신동향분석
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• 제14권6호통권60호
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• pp.51-63
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• 1999

IPSEC (Internet Protocol Security) is a network layer security protocol that is designed to support secure TCP/IP environment over the Internet considering flexibility, scalability, and interoperability. IPSEC primarily supports security among hosts rather than users unlike the other security protocols. Recently, IPSEC is emphasized as one of the important security infrastructures in the NGI (Next Generation Internet). It also has suitable features to implement VPN (Virtual Private Network) efficiently and its application areas are expected to grow rapidly. In this paper, the basic concepts and related standard documents of IPSEC will be introduced.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.13-16
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• 2000

Recently, with the advent of satellite communication technologies, the network access service through satellites has emerged as an alternative to existing ones. Of satellite access services including multimedia services, the high speed internet access service will be one of the important services. Particularly, the efficient transportation of real time internet traffic seems very essential. The aim of this research is to examine the applicability of the IETF RTP protocol in the satellite access network. The RTP has been developed for the QoS-met transportation protocol of real time traffic over the existing best-effort internet. This paper summarizes the RTP protocol, and describes the architecture of the implementation of the RTP. And also, the compressed RTP header protocol is discussed for the applicability to the satellite link.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.234-236
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• 2004

Transmission control protocol(TCP) is protocol used in internet. TCP is seldom transmission error and is protocol based on wire environment. TCP uses 3 way handshake ways, data transmission control through windows size, data transmission control through reception confirmation, sliding window for packet delivery. In this study, designed TCP packet ion module for analyze the TCP segments & correct information about TCP. TCP capture in internet using designed TCP module and analysed TCP segments composition. Through this, could analyze the correct information of protocol in network.