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보안이 적용된 VoIP 시스템의 합법적 감청을 위한 미디어 키 분배 기법
노효선,정수환,Roh Hyo-Sun,Jung Sou-Hwan 한국통신학회 2006 한국통신학회논문지 Vol.31 No.8B
본 논문에서는 보안이 적용된 VoIP 시스템에서 합법적 감청 지원을 위한 미디어 키 분배 기법을 제안하였다. 현재 제정되고 있는 미국과 유럽의 감청 표준은 양단간에 보안이 적용된 VoIP 시스템의 경우, 보안이 적용된 키정보를 수집하는 메커니즘이 정의되어 있지 않아 감청에 어려움이 예상된다. 제안된 기법은 미디어 트래픽의 암호화를 위해 사용한 미디어 키를 ISP AAA 서버, TSP 등록 서버와 UA 간의 대칭키로 이중 암호화하여 각 서버에 보관하였다가 합법적 감청 기관으로부터 승인된 감청 요청이 있을 경우 각 서버에서 미디어 키를 합법적 감청 기관으로 전달하여 암호화된 미디어 트래픽을 감청 할 수 있는 방법을 제안하였다. 이 방법은 이중으로 암호화된 미디어 키를 어느 한쪽 서버에서 임의로 확인할 수 없으며, 합법적 감청 승인을 받은 감청 기관에 의해서만 미디어 키를 확인할 수 있기 때문에 무분별한 감청 시도를 방지할 수 있어 개인의 사생활을 보호할 수 있다. This paper proposes a media key distribution scheme for lawful interception in secured VoIP systems. A problem of the current US or EU standards for lawful interception is that they do not provide a mechanism for collecting keys used for encrypting media streams between two end points. In the proposed scheme, dual encryption was applied on the media keys using two shared secrets: one between the ISP AAA server and user agent, and the other between the TSP registrar and user agent. Only the lawful agency with court warrant can collect both keys from the service providers. This scheme can still provide a privacy by preventing the misusage of the keys by the service providers.
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Open IPTV 환경에서 재암호화 과정 없는 댁내 컨텐츠 분배를 위한 키관리 기법
정서현(Seo-Hyun Jung),노효선(Hyo-Sun Roh),이현우(Hyun-Woo Lee),이정현(Jeong-Hyun Yi),정수환(Sou-Hwan Jung) 한국컴퓨터정보학회 2010 한국컴퓨터정보학회논문지 Vol.15 No.7
Due to the advancement of IPTV technologies, open IPTV services are a step closer to becoming reality. In such service environment, users are able to enjoy IPTV services using a variety of devices available at their home domain. However, it is impossible to get such flexible services at their convenience unless each of devices is individually connected to Set-Top-Box (STB) because of Conditional Access System (CAS) or service providers otherwise allow STB to freely distribute decoded contents to every user devices attached to STB. In this paper, we propose a key management scheme for securely distributing contents from STB to multiple user devices at home domain. The proposed scheme also makes the service providers be able to control the access rights to each of user devices without installing individual STBs. It is achieved by computationally dividing a private key of RSA signature scheme into three parts and thus makes possible to distribute the contents scrambled through a underlying CAS mechanism without re-encrypting them that the existing scheme should employ. It improves significantly computation and communication complexities, maintaining it as secure as the existing schemes. Additionally, it prevents misbehaving users from illegally distributing the contents from STB to their devices available at home domain.
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포부자추출물의 갑상선기능저하증 흰쥐모델에서의 한열조절작용에 의한 개선효능 연구
황민섭 ( Min Sub Hwang ),황지혜 ( Ji Hye Hwang ),강석용 ( Seok Yong Kang ),강안나 ( An Na Kang ),노효선 ( Hyo Sun Roh ),박용기 ( Yong-ki Park ) 대한본초학회 2016 대한본초학회지 Vol.31 No.6
Objective : To suggest a scientific evidence of Aconitum carmichaeli Debx. (Aconiti Lateralis Radix Preparata: ALRP) as one of cooling and heating medicines on the regulation of body temperature, we investigated the effects of ALRP water extract on hypothyroidism. Methods : Hypothyroidism was induced by intradermal injection with PTU for 4 weeks in SD rats. ALRP extract or L-thyroxine as a control drug was orally administrated for 2 weeks with PTU injection in rats. The physiological and serological parameters were measured in rats. The histological change of thyroid tissues was observed by H&E staining, and also the expression of thermo-regulating proteins was determined by Western blot in dorsal root ganglia and brain tissues of rats. Results : The administration of ALRP extract in PTU-induced hypothyroidism rats was significantly increased body temperature, but did not changes on body weight, food and water intake. ALRP extract did not effect on the levels of TSH and T4 in the hypothyroidism rats. ALRP extract significantly decreased the levels of GPT, glucose, HDL-cholesterol, LDL-cholesterol, and total cholesterol in the hypothyroidism rats. In histological observation, the enlarged epithelium and atrophic follicles with higher concentration of follicular cells on hypothyroidism were improved by ALRP extract. In addition, ALRP extract increased the expression of TRPV1 and TRPM8 ion channel proteins in hypothyroidism rats. Conclusion : These results indicate that ALRP extract can improve PTU-induced hypothyroidism through regulation of body temperature and lipid accumulation. The action mechanism of ALRP extract is related with body temperature control by thermoregulation with TRP ion channels.
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