• Annual Conference of KIPS
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• 2013.05a
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• pp.463-466
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• 2013

본 논문은 클라이언트에게 콘텐츠를 서비스하는 스트리밍 서버 등에서 정보 중심 네트워크와 연동하기 위하여 가상 파일 시스템을 이용하는 방법을 설명한다. 특히 콘텐츠의 식별자를 포함하는 파일 오퍼레이션을 통하여 콘텐츠 서버와 정보 중심 네트워킹 노드와 연동함으로써 콘텐츠 서비스 프로토콜과 정보 중심 네트워킹 프로토콜간의 독립성을 유지할 수 있다.

• Information and Communications Magazine
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• v.30 no.3
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• pp.67-72
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• 2013

본 고에서는, 미래 인터넷 (Future Internet) 연구에 있어서, 가장 많은 관심과 가능성 예측에 기반한 실제적인 투자를 이끌어 내고 있는 두 개의 주요 핵심 기술 분야인 콘텐츠 중심 네트워킹 (Content-Centric Networking: CCN)과 소프트웨어 정의 네트워킹 기술 (Software-Defined Networking: SDN)의 접목에 대해서, 그 배경과 당위성 그리고 관련 연구 동향을 살펴 본다.

• Information and Communications Magazine
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• v.29 no.9
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• pp.51-55
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• 2012

본고에서는 최근 미래 인터넷의 주요 핵심 기술로 주목 받고 있는 콘텐츠 중심 네트워킹 기술에 대해서, 이러한 기술연구가 시작되게 된 배경과 관련 연구, 산업체 및 표준 현황에 대해 살펴본다. 특히 여러 후보 기술들 중, 그 개념의 완성도 및 실현 가능성에 있어서 가장 앞서 있는 CCN (Content-Centric Networking)을 중심으로 콘텐츠 중심 네트워킹의 동작원리를 설명하고, 관련 주요 사용 예 (Use Case)와 향후 전망에 대해 짚어본다.

• Information and Communications Magazine
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• v.29 no.9
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• pp.56-62
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• 2012

초고속 인터넷, 다양한 통신 기기, 신규 인터넷 애플리케이션 등의 확산으로 인터넷 상의 콘텐츠 트래픽 규모가 급격하게 증가하고 있다. 비디오와 같은 대용량 멀티미디어 콘텐츠 트래픽이 전체 트래픽에서 차지하는 비중은 날로 증가하여, 2014년에는 전체 인터넷 트래픽 중 90% 이상을 차지할 것이라고 예측되기도 한다. 따라서 트래픽의 대부분을 차지하는 콘텐츠 중심으로 네트워크 아키텍처를 혁신할 필요성이 대두되고 있다. 본 논문은 최근 급증하는 콘텐츠 서비스의 송수신 특성에 적합한 네트워크 아키텍처에 대한 학계와 산업체의 연구동향과 콘텐츠 네트워킹 관련 기술의 국제 표준화 동향을 고찰하고, 향후 실제 적용을 위한 이슈를 분석한다.

• Journal of Korea Multimedia Society
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• v.16 no.8
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• pp.954-961
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• 2013

To enhance the efficiency of network, content-centric networking (CCN), one of future Internet architectures, allows network nodes to temporally cache transmitted contents and then to directly respond to request messages which are relevant to previously cached contents. Also, since CCN uses a hierarchical content-name, not a host identity like source/destination IP address, for request/response packet routing and CCN request message does not include requester's information for privacy protection, contents-providers/ network nodes can not identify practical requesters sending request messages. So to send back relevant contents, network nodes in CCN records both a request message and its incoming interfaces on Pending Interest Table (PIT). Then the devices refer PIT to return back a response message. If PIT is exhausted, the device can not normally handle request/response messages anymore. Hence, it is needed to detect/react attack to exhaust PIT. Hence, in this paper, we propose improved detection/reaction schemes against attacks to exhaust PIT. In practice, for fine-grained control, this proposal is applied to each incoming interface. Also, we propose the message framework to control attack traffic and evaluate the performance of our proposal.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.07a
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• pp.115-116
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• 2017

본 논문에서는 스포츠 경기장에서 응원 그룹 서비스를 제공하기 위한 사용자가 밀집된 그룹 통신을 위한 효율적인 CCN 멀티캐스트 라우팅 및 캐싱 기법을 사용한 스포츠 모바일 서비스 플랫폼과 모바일 응원 어플리케이션을 개발하였다. 응원 그룹 운영을 위해 CCN 코어 라우터는 경기 시작 전에 서비스 서버로부터 콘텐츠 이름, 데이터, 콘텐츠의 라이프타임이 포함된 경기 관련 콘텐츠를 전달받아, 경기가 시작되면 서비스한고, 경기가 끝나면 라이프타임 후에 삭제할 수 있도록 설계하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.4
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• pp.234-241
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• 2014

xTo improve network inefficiency caused by network congestion around a content-source, content-centric networking (CCN) allows network nodes transmitting contents to temporarily cache received contents and then send back the cached contents if the nodes receive relevant request messages without forwarding the request messages to content-sources. However, because nodes receiving requested contents through CCN cannot recognize real senders of the received contents, the receivers need to verify each received contents before using them. But such a verification procedure can cause long service/operation delay. Hence, in this paper, we review the problem of contents verification, propose an improved verification procedure and evaluate its performance.

• Journal of the Korea Society for Simulation
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• v.26 no.1
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• pp.21-38
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• 2017

Information Centric Networking is changing the way how content is being transmitted. The shift from IP and host based networking towards content based networking scenario is growing day by day. Many researches have been done about different frameworks of ICN. Caching is an important part of ICN and many researchers have also proposed different ways for caching the data. With caching of data in intermediate devices like the network devices as well the user devices in some cases, the issue of content security as well as the role of the content producer becomes a major concern. A modified ICN architecture based on the current Content Centric Networking (CCN) model is presented in the paper. The architecture mainly focuses on involving the content producer in content delivery in the real time. The proposed architecture provides better security aspects for the CCN architecture. Apart from security the paper will also consider the issue of applicability of CCN architecture to replace the TCP/IP based architecture. The efficiency of the proposed architecture is compared with the previous CCN architecture based on the response time for a content delivery which shows very comparable level of efficiency. The paper than analyzes different beneficial aspects of the proposed architecture over the current architecture.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.24 no.1
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• pp.155-163
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• 2014

To enhance network efficiency, content-centric networking (CCN) proposes that intermediated network nodes on a content-delivery path temporally cache transmitted contents. Then if an intermediated node receives a content request message (Interest) for previously cached content, the node directly transmits the cached content as a response message (Data) to requestors and finishes the transmission of the received Interest. Since Interest is performed by intermediated network nodes, it is possible to efficiently transmit contents and to effectively solve a network congestion problem caused around contents sources. For that, CCN utilizes both content store to temporarily cache content and pending Interest table (PIT) to record Interest incoming Face. However, it has mentioned the possibility of denial service attack using both the limitation of PIT resource and fake Interests. In this paper, we briefly describe the presented PIT flooding attack utilizing fake Interest. Then we introduce new attack possibility using fake Data and propose a countermeasure for the proposed attack. Also we evaluate the performance of our proposal.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.11
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• pp.743-754
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• 2014

Recently, Information-Centric Networking(ICN), different from traditional IP-based networking, has been highlighted. Content-Centric Networking(CCN), proposed by Van Jacobson, is a representative scheme of the ICN architectures. It can deliver messages slightly faster than the IP-based networking by focusing on the access and delivery to the content itself. However, CCN is restricted to distribute the information without transmitting the request packet in advance because it is pull-based architecture by content requester. In addition, it has a problem that the Pending Interest Table(PIT) could be overloaded easily when DDoS attack happens. In this paper, we suggest an algorithm using a push-based scheme without request packets and overcoming PIT overload situation by Interest Group Push Table(IGPT). The proposed scheme enables to transmit a large amount of content than an existing scheme during the same amount of time in terms of timely-delivery and security.