• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.6
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• pp.1121-1129
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• 2013

Recent malware distribution causes severe and nation-wide problems such as 3 20 cyber attack in Korea. In particular, Drive-by download attack, which is one of attack types to distribute malware through the web, becomes the most prevalent and serious threat. To prevent Drive-by download attacks, it is necessary to analyze MDN(Malware Distribution Networks) of Drive-by download attacks. Effective analysis of MDN requires a detection of obfuscated and/or encapsulated JavaScript in a web page. In this paper, we propose the scheme called Multi-level emulation to analyze the process of malware distribution. The proposed scheme analyzes web links used for malware distribution to support the efficient analysis of MDN.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.29 no.6
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• pp.1225-1234
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• 2019

The security of the firmware is more important because embedded devices have become popular. Network devices such as routers can be attacked by attackers through web application vulnerabilities in embedded firmware. Therefore, they must be found and removed quickly. The Firmadyne framework proposes a dynamic analysis method to find vulnerabilities after emulating firmware. However, it only performs vulnerability checks according to the analysis methods defined in the tool, thus limiting the scope of vulnerabilities that can be found. In this paper, fuzzing is performed in emulation-based environment through fuzzing, one of the software security test techniques. We also propose a Fabfuzz tool for efficient emulation based fuzzing. Experiments have shown that in addition to the vulnerabilities identified in existing tools, other types of vulnerabilities have been found.

• TTA Journal
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• s.96
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• pp.69-77
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• 2004

We developed QoS based Optical Transport System for premium packet transport network.. Our system will reduce capital cost and operation cost. And also It generate QoS guaranteed L2 VPN service for enterprise. The key technologies are packet emulation for

• Electronics and Telecommunications Trends
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• v.14 no.2 s.56
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• pp.96-113
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• 1999

1999년 1월 18일부터 22일까지 미국, 마우이(Maui)에서 개최된 T1P1 표준화 회의에서 논의된 ATM LAN/E 전송기술은 버전 2.0으로 문제점 개선이 거의 완료시점에 도달해 있으나 ATM LAN 전송기술의 표준은 MPOA로 방향이 잡혀가고 있다. 그러나 연구기관과는 달리 산업체 네트워크 환경은 기업경영과 많은 관계가 있으므로 신기술을 채택하기 위한 투자는 신중할 수밖에 없다. 또한 산업체 네트워크의 응용 프로그램은 대용량 대역폭, 실시간 전송이 필요한 음성 및 데이터 통신의 통합 등이 아직 활성화되고 있지 않기 때문에 기 투자된 네트워크 자원을 최대한 활용할 뿐만 아니라 효율을 최대한 높일 수 있는 방안을 모색하여 안정적인 네트워크를 운영하는 것이 최선이라 할 수 있다. 따라서 본 논문에서는 이러한 측면에서 현재의 문제점을 분석하고 개선방안 및 표준화 동향을 제시하여 네트워크의 안정적 운영과 추후 신기술 도입시 그 변화에 대한 충격을 최소화하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10c
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• pp.384-386
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• 1999

ATM 통신망의 성공 및 확산을 위해서는 신규서비스의 창출과 함께 기존 서비스의 가격 경쟁력 있는 수용이 요구되는데, 인터넷 (IP)은 그 사용자 및 서비스의 수요를 고려할 때 ATM 망에서 가장 먼저 수용해야 할 서비스로서 현재 ATM 통신망에서의 인터넷 수용방안이 다양하게 논의되고 있다. 본 논문에서는 전력정보통신망을 전제로 하여 ATM WAN 통신망에서의 IP 서비스 수용에 관심을 두고 이를 위한 두 가지 방안으로 LAN Emulation 모델과 간단한 형태의 IP Internetworking 모델을 설정하고, LAN 과 WAN 접속구간의 서비스 카테고리가 ABR(Available Bit Rate)과 UBR(Unspecified Bit Rate)인 경우에 대해서 각 모델별로 적용하여 시뮬레이션을 수행하였다. 성능 비교를 위해 TCP 계층과 ATM 계층에서의 end-to-end delay를 분석한 결과, LAN-Emulation 모델을 적용하는 경우 간단한 형태의 IP Internetworking 모델에서 보다 성능효율이 우수하고, LAN과 WAN 접속구간의 서비스 카테고리는 백본 ATM 교환기와 Edge 단말에서의 버퍼크기가 동일한 경우 ABR이 UBR보다 성능효율이 우수함을 알 수 있었다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.22 no.5
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• pp.1018-1025
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• 1997

In this paper, we propose the interworking and emulation methods for the interoperability of ABR/ABT capability and algo propose the BCR Re-negotition with State-Dependent (BRSD) mechanism based on the common buffer with two thresholds and the EBCN method when public network hs the ABT capability. As BRSD mechansism has one common buffer for all ABR connectiona and BCR re-negotiation request according to the threshold, it can reduce the queue length and the frequency of ABT BCR re-negotiation. Using EBCN method, BRSD mechanism can prevent the continuous increasing of queue length in the emulation method with the CI bit setting of the ABR performance of the BRSD mechanism in the view poits of the masimum queue length, bandwidth utilization and ABT-BCR re-negotialtion frequency trough the simulation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.10a
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• pp.354-356
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• 2021

For science applications that requires rapid transfer and sharing of large volume data, many efforts to improve data transfer performance have been made based on concurrency, parallelism and pipelining in data transfer applications such as Globus/GridFTP. In this paper, as a similar trial, experiments have been conducted for the expected transfer throughput enhancement by the increased number of network interface and parallelism in the Mptcp emulation environment and the result is presented.

• The Journal of the Korea Contents Association
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• v.4 no.1
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• pp.1-7
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• 2004

In addition to wired communication technology, wireless communication technology has been driving communication revolution nowadays. Bluetooth technology carries out data/voice communication making pico-net and the various application services are supported by access network connected to public network. This paper presents educational software development of bluetooth protocol stack including HCI, L2CAP, RFCOMM, SDP and profiles including GAP, SPP, GEOP, FTP. This software which supports programming environment of these protocol monitoring and emulation is implemented basically step by step for education based on H connected to the bluetooth device through RS-232-C, UART or USB cable. Application program coded by Visual C is operated over the firmware loaded on the bluetooth device connected to the PC. Additionally ftp and chatting function are developed to enhance educational efficiency.

• The KIPS Transactions:PartC
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• v.9C no.5
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• pp.725-732
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• 2002

Presented is a Genetic Algorithm (GA) for dynamic partitioning an ATM LANE(LAN Emulation) network. LANE proves to be one of the best solutions to provide guaranteed Quality of Service (QoS) for mid-size campus or enterprise networks with minor modification of legacy LAN facilities. However, there are few researches on the efficient LANE network operations to deal with scalability issues arising from broadcast traffic delivery. To cope with this scalability issue, proposed is a decision model named LANE Partitioning Problem (LPP) which aims at partitioning the entire LANE network into multiple Emulated LANs (ELANS), each of which works as an independent virtual LAN.

• Journal of the Korea Society for Simulation
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• v.25 no.4
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• pp.43-52
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• 2016

Wireless sensor network (WSN) technology has been implemented using commercial off-the-shelf microcontrollers (MCUs), In this paper, we propose a simulation environment to realize the physical evaluation of FPGA-based node by considering vertically cross-layered WSN in terms of physical node device and network interconnection perspective. The proposed simulation framework emulates the physical FPGA-based sensor nodes to interoperate with the NS3 through the runtime infrastructure (RTI). For the emulation and interoperation of FPGA-based nodes, we extend a vendor-providing FPGA design tool from the host computer and a script to execute the interoperation procedures. The standalone NS-3 is also revised to perform interoperation through the RTI. To resolve the different time-advance mechanisms between the FPGA emulation and event-driven NS3 simulation, the pre-simulation technique is applied to the proposed environment. The proposed environment is applied to IEEE 802.15.4-based low-rate, wireless personal area network communication.