http://purunamu.blogspot.kr/2011/09/ssl-web-proxy.html - SSL Web Proxy http://blog.daum.net/cson001/32 - Proxy Server http://blog.naver.com/PostView.nhn?blogId=nttkak&logNo=20130246203 - SSL 소개 http://redtiger.tistory.com/entry/SSL-%EC%86%8C%EC%BC %93%ED%86%B5%EC%8B%A0 - SSL 소켓 통신 http://blog.naver.com/PostView.nhn?blogId=lakewow&logNo=120162054049 - VPN http://support.oullim.co.kr/portal/Techletter/20080215/news4.htm VPN & SSL VPN http://openvpn.net/ - OPEN VPN http://www.realsecu.net/new/02_business/sa.php - SSL VPN h/w 장치 판매 http://blog.naver.com/PostView.nhn?blogId=whdmsfk&logNo=40021593232 - SSL VPN http://www.netbuysell.co.kr/PDS/20080509/SSL-VPN.pdf - SSL VPN 활용 가이드