• Annual Conference of KIPS
• /
• 2011.11a
• /
• pp.733-734
• /
• 2011

지난 몇 년 동안 무선랜(Wireless LAN)은 다양한 영역에서 가장 널리 사용 되었으며, 가장 크게 발전을 하였다. 그러나 무선랜의 특성상 해킹과 침투에 취약한 약점을 안고 있다. 아직도 많은 보안적 취약점을 가지고 있으며, 특히 그 중에서도 Rogue AP(Access Point)는 가장 심각한 보안 취약점으로 대두되고 있다. 현재 Rogue AP 탐지를 위하여 넷스텀블러와 같은 스니핑 소프트웨어를 설치하여 주변 지역을 돌아다니는 워드라이빙 형태의 탐지방법은 아직도 사용되고 있다. 그러나, 이러한 방법은 대규모로 확장되어 가는 무선랜 환경에 적합하지 않다. 본 논문은 무선랜 환경에서 Rogue AP 탐지 문제의 해결책을 제시한다. AP의 전파 영역을 이용하는 방식으로, AP가 신호를 받을 수 있도록 수정하여, 주변에 새로운 AP가 탐지될 경우, AP가 서버와 새롭게 발견된 AP에 신호를 보내고, 이를 바탕으로 서버는 WhiteList를 통해서 Rogue AP 여부를 결정한다. 따라서 본 논문의 제안 방식은 기존의 탐지 방식에 비해 Rogue AP의 효과적 탐지가 가능하다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.632-634
• /
• 2012

In order for the connection to the wireless network from the list of priorities of the wireless AP to AP profile automatic connection by selecting the preferred method to register a profile, which is determined at the time of the change, the user does not respond to the demands of the part. In this study, the frequency of the user's access in accordance with the wireless AP, and by creating a profile, the user needs to meet with regard to network access adaptive research.

• Journal of Korea Multimedia Society
• /
• v.12 no.11
• /
• pp.1521-1529
• /
• 2009

There is a serious unfairness problem between upstream and downstream flows of AP in IEEE 802.11 Wireless LAN. This problem is because Wireless LAN's DCF MAC protocol provides AP with equal channel access priority to mobile noded. Also, it makes this problem worse that the TCP's Data segment loss is more effective on throughput than the TCP's ACK segment. In this paper, we first make several simulations to analysis the unfairness in the various point of view and to find reasons of the unfairness. Also, this paper presents AP's scheduling scheme to alleviate the unfairness problem and evaluate the scheme through ns2 simulator.

• Annual Conference of KIPS
• /
• 2006.05a
• /
• pp.1255-1258
• /
• 2006

무선 단말기를 이용하여 무선 인터넷을 사용하는 경우 이동성으로 인해 사용자가 특정 AP에 집중하여 과부하가 발생할 수 있다. 본 논문에서는 사용자에게 최적의 AP 위치를 알려주어 사용자의 이동을 유도함으로써 AP의 과부하를 방지하고, 보다 높은 네트워크 대역폭을 확보할 수 있게 하는 최적 AP 자동 접속 시스템의 구현 내용을 기술한다.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.29 no.3A
• /
• pp.293-302
• /
• 2004

Wireless LAN is a rather mature communication technology that connects mobile terminals. A typical wireless LAN system is composed of one AP and more than one terminals, which is called a BSS. Terminals near to an AP can receive high rate data but terminals far from an AP may not receive data with guaranteed high speed rate because received signal strength is weakened. This paper proposes a method to allow high speed data transmission by grouping terminals and using part of wireless terminals as repeaters. We compare and analyze proposed grouping algorithms based on Depth First Search and Breadth First Search via simulations. A grouping algorithm based on Breadth First Search is shown to be more effective in term of efficiency and coverage.

• Convergence Security Journal
• /
• v.10 no.4
• /
• pp.21-30
• /
• 2010

Wireless network is one of the 2010's most important security issues. As smartphone is popularize, the number of Wireless Internet users is really growing and wireless AP spring up everywhere. But most wireless AP haven't being managed properly in terms of security, Wireless Internet users also don't recognize important of security. This situation causes grave security threats. This paper design and analyze a new cyber attack whose it circulates malware via QR code and activates Mobile AP to induce service charge. The new vulnerability we suggest forces to activate Mobile AP of smartphone based on Android and responds to all Probe Request are generated around, and brings induction of service charge and communication problems in its train.

• Journal of Satellite, Information and Communications
• /
• v.9 no.4
• /
• pp.16-19
• /
• 2014

In this paper, the beacon signals of WiFi doppler frequency detection based WiFi-AP was designed with the subcarrier between a transmitter and a receiver of WLAN(wireless LAN). We can use such signals to identify human moving as an antenna array and tracking of RF beam. This wireless security services with the combination of WiFi doppler frequency and adaptive beacon time signal was proposed for wireless detection and motion based services.

• Annual Conference of KIPS
• /
• 2004.05a
• /
• pp.1185-1188
• /
• 2004

기존의 IEEE 802.11 표준에 따르는 무선랜에서 보안에 취약한 점들이 발견된 후, 이를 보완하기 위한 802.11i 규격이 작성되고 있다. 이에 따르면, STA가 로밍하는 과정에서 new AP와 reassociation 이후 AP로부터 인증을 받는 과정을 추가로 거쳐야 한다. 이는 로밍 과정에서 발생하는 지연을 늘리고, 따라서 데이터 프레임들의 손실을 가져온다. 그런데, new AP와 STA 사이의 보안협상이 완료될 때까지, old AP에서 손실될 데이터 프레임을 old AP의 보안 정보를 적용하여 new AP를 통해서 STA로 전달함으로써 이러한 데이터 손실을 막을 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.18 no.4
• /
• pp.91-96
• /
• 2018

Recently, as artificial intelligence technology becomes popular, demand for wireless traffic is rapidly increasing. In order to provide services in response to the increase in demand for wireless traffic, telecommunication companies are generalizing the installation of public APs. In order to provide convenience of using wireless APs between communication companies, it is necessary to share the use of APs in public places to efficiently use wireless resources in a public place, to pre-authenticate between wireless APs in a mobile communication service, So as to increase the convenience of the user. In this paper, we propose to share APs in public places through handoff between APs and pre-authentication between carriers in mobile communication services. The simulation results show that the handoff latency is improved by 35.1% and the bandwidth used by the AP selected by the pre-authentication method can utilize more bandwidth than the method of automatically selecting the AP.

• Journal of the Korea Society of Computer and Information
• /
• v.17 no.12
• /
• pp.131-136
• /
• 2012

In these days, with the diffusion of mobile equipments, the number of WiFi Access Point (AP) is increasing, and the growth of WiFi AP causes the throughput degradation due to interferences between APs. This recent phenomenon demands the method able to be utilized with current WiFi network to improve the throughput of Wireless LANs. This paper studied the channel assignment method and several throughput enhancement methods to optimize Radio Resource Management (RRM) for distributed infrastructure WLANs. As a result, it was able to put AP independently, improve older allocation error, and improve execution speed.