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Content-Length 통제기반 HTTP POST DDoS 공격 대응 방법 분석
이대섭(Dae-seob Lee),원동호(Dong-ho Won) 한국정보보호학회 2012 정보보호학회논문지 Vol.22 No.4
OSI 7계층 DDoS 공격 기법중 하나인 HTTP POST DDoS 공격은 서버의 자원을 고갈시켜 정상적인 서비스를 방해하는 서비스 거부 공격 기법이다. 이 공격은 적은 양의 공격 트래픽만으로도 효과적인 공격이 가능하며 정상적인 TCP 연결을 이용하고 있어 정상적인 사용자 트래픽과 공격 트래픽을 구분하는 것이 어렵다. 본 논문에서는 HTTP POST DDoS 공격에 대한 대응 방안으로 비정상 HTTP POST 트래픽 탐지 알고리즘과 HTTP POST 페이지별 Content-Length 제한기법을 제안한다. 제안한 방안은 HTTP POST 공격도구인 r-u-dead-yet과 자체 개발한 공격 도구를 이용하여 HTTP POST DDoS 공격을 오탐 없이 탐지 대응하였음을 보여주었다. One of the OSI 7 Layer DDoS Attack, HTTP POST DDoS can deny legitimate service by web server resource depletion. This Attack can be executed with less network traffic and legitimate TCP connections. Therefore, It is difficult to distinguish DDoS traffic from legitimate users. In this paper, I propose an anomaly HTTP POST traffic detection algorithm and http each page Content-Length field size limit with defense method for HTTP POST DDoS attack. Proposed method showed the result of detection and countermeasure without false negative and positive to use the r-u-dead-yet of HTTP POST DDoS attack tool and the self-developed attack tool.
이대섭(Lee Dae Seob),홍원순(Hong Won Soon) 한국정보보호학회 2007 情報保護學會誌 Vol.17 No.6
정보보호제품의 안전성 및 신뢰성이 검증된 제품의 공급 및 이용 촉진을 위해 운영되고 있는 정보보호제품 CC 인증제도, 암호제품에 대한 암호 검증제도, 공공기관 도입 정보보호제품에 대한 보안적합성 검증제도 등에 대한 현황 및 향후 추진방향을 살펴본다.
이대섭 ( Lee Dae Seob ),김경량 ( Kim Gyeong Lyang ),하서현 ( Ha Seo Hyeon ) 한국농업경제학회 2004 農業經濟硏究 Vol.45 No.1
N/A After URAA the global rice market has been liberalized significantly. Members of the WTO agreed to a process of tariffication, to bind those tariffs, and to subject them to reductions. Lowering tariffs and expanding tariff rate quotas (TRQs) will focus primarily on increasing Japanese and South Korean rice imports from the URAA agreements. These two markets are critical for expanding global trade in japonica rice. Recent tariffication by Japan has slowed the increase in minimum access imports and placed a high tariff on above-quota imports. In the meantime, U.S. rice experts to Japan and South Korea will likely increase due to their market expansion, especially japonica type of rice. However there s not been many research considering U.S. rice exports to Japan and South Korea even though the U.S. might be a major exporter to Japan and South Korea. Therefore, this research attempts to analyze U.S. exports to Japanese and South Korean import markets using econometric technique and simulate some possible scenarios related to WTO negotiations. The results show that U.S. export to Japan would have increased if Japanese tariffs decreased by more than 6% annually. In the case of South Korea, compared to the actual imports, U.S. export would have increased significantly in the scenarios from 4% to 8% decrease in tariffs. Based upon the WTO negotiations, South Korea will have to increase their rice imports, and Japan will likely be required to reduce its import tariffs. The U.S. and major export countries will seek to increase their market shares in both countries. Moreover, it is expected to focus on State Trading Enterprises (STEs), transfer to commodity-specific in domestic support category, and expansion in rice market access lowering tariffs in the ongoing and future rice trade negotiations.