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VANET에서 ECDH 기반 그룹키를 이용한 그룹간 인증 설계
이병관,정용식,정은희,Lee, Byung Kwan,Jung, Yong Sik,Jeong, Eun Hee 한국산업정보학회 2012 한국산업정보학회논문지 Vol.17 No.7
본 논문에서는 안전한 V2V 통신과 V2I 통신을 보장하는 ECDH(Elliptic Curve Diffie Hellman) 기반 그룹키를 제안하였다. 본 논문에서 제안하는 ECDH기반 그룹키는 AAA 서버를 사용하지 않고 차량과 차량사이의 그룹키인 VGK(Vehicular Group Key), 차량 그룹 사이의 그룹키인 GGK(Globak Group Key), 그리고 차량과 RSU사이의 그룹키인 VRGK(Vehicular and RSU Group Key)를 ECDH 알고리즘을 이용하여 생성한다. 차량과 RSU 사이의 그룹키인 VRGK는 현재 RSU에서 다음 RSU에게로 RGK(RSU Group Key)로 암호화하여 안전한 채널을 통하여 전달하기 때문에 완벽한 순방향 기밀(Perfect Forward Secrecy) 보안 서비스가 제공된다. 또한, 메시지를 전송한 차량이 해당 그룹의 구성원인지를 그룹키 이용하여 확인함으로써 Sybil공격을 탐지할 수 있다. 그리고 그룹간의 안전한 통신으로 불필요한 네트워크 트래픽이 발생하지 않으므로 메시지 전송 시간 및 서버의 오버헤드를 줄일 수 있다. This paper proposes a group key design based on ECDH(Elliptic Curve Diffie Hellman) which guarantees secure V2V and V2I communication. The group key based on ECDH generates the VGK(Vehicular Group key) which is a group key between vehicles, the GGK(Global Group Key) which is a group key between vehicle groups, and the VRGK(Vehicular and RSU Group key) which is a group key between vehicle and RSUs with ECDH algorithm without an AAA server being used. As the VRGK encrypted with RGK(RSU Group Key) is transferred from the current RSU to the next RSU through a secure channel, a perfect forward secret security is provided. In addition, a Sybil attack is detected by checking whether the vehicular that transferred a message is a member of the group with a group key. And the transmission time of messages and the overhead of a server can be reduced because an unnecessary network traffic doesn't happen by means of the secure communication between groups.
서해중부 태안해안의 현장 부유입자물질 분포와 거동 연구
이병관 ( Byoung Kwan Lee ),장성건 ( Seong Geon Jang ),김진현 ( Jin-hyun Kim ),황다혜 ( Da Hye Hwang ),김소연 ( So Yun Kim ),최윤영 ( Yun-young Choi ),이병준 ( Byung Joon Lee ) 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.6
In-Situ Suspended Particulate Matter(SPM) concentration of the water column and particle size distribution above the middle layer and bottom layer were measured in the Taean-Haean National Park, West Coast of Korea. The short-term series of in-situ suspended particulate matter concentration, total volume concentration, beam attenuation coefficient, mean grain size, floc size and distribution have been ensemble averaged according to tidal variation. Time variation of in-situ particle size and concentration shows bottom layer supplies relatively fine-grained particles with compared to middle layer. This explains a good correlation between sediment concentration and beam attenuation coefficient due to well defined, monotonous size distribution. Abundance of small microfloc and large macroflos with time and water column size distribution indicated the difference between organic matter in marine snow of turbidity maximum near-bottom layer and fine grain primary particles of water column. The particles supplied toward lower water column from upper water column during low tide showed a multi-modal distribution with two-three peak at coarse fraction, possibly due to the resuspension and the flocculation associated with marine biological activity and the increased shear velocity at near bottom, break-up of large flocs. This study can be used qualitative and quantitative analysis of in-situ fine suspended sediment distribution, resuspension and flocculation, land(fresh water) and marine(sea water) based source of suspended particulate matters, according to marine environmental relationship and global climate change.
Methotrexate를 이용한 보존적 치료로 성공한 유착태반
이병관 ( Byung Kwan Lee ),강경화 ( Kyung Hwa Kang ),노정훈 ( Jeong Hoon Rho ),오관영 ( Kwan Young Oh ),양윤석 ( Yoon Seok Yang ),황인택 ( In Taek Hwang ),정지학 ( Ji Hak Jung ),박준숙 ( Joon Suk Park ) 대한산부인과학회 2005 Obstetrics & Gynecology Science Vol.48 No.2
Placenta accreta is a rare condition and is associated with considerable maternal morbidity and mortality. Though hysterectomy is a definitive therapy, there are some occasions that conservation of the uterus is desired by the patient and bleeding is not