TAILIEUCHUNG - Open VPN and The SSL VPN Revolution

OpenVPN is an open source software application that implements virtual private network (VPN) techniques for creating secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It uses a custom security protocol[2] that utilizes SSL/TLS for key exchange. It is capable of traversing network address translators (NATs) and firewalls. It was written by James Yonan and is published under the GNU General Public License (GPL) | OpenVPN and the SSL VPN Revolution Charlie Hosner GSEC SANS Institute 2004 As part of the Information Security Reading Room Author retains full rights. TABLE OF CONTENTS QUICK INTRO TO Symmetric Ciphers - Message Digests - Asymmetric Ciphers - Everything VPN IN A WHAT THE HECK IS IPSEC .7 SO HOW DO THESE THINGS WORK .9 SSL TLS TO THE OPENVPN OPENVPN User chroot the Adjust the OPENVPN Throughput NAT X509 Easelof Load Central OPENVPN Key Key Derivation Symmetric HMAC Additional OpenVPN OPENVPN Single UDP port config file and TUN Pseudo DHCP OTHER SSL The Four Horsemen of SSL Security WORK SANS Institute 2004 As part of the Information Security Reading Room Author retains full rights. Abstract True SSL VPNs are beginning to appear in the market. One of the best and definitely the least expensive is the open source SSL VPN OpenVPN. IPSec VPNs are either too expensive or too difficult to use securely. IPSec is dense and contains too many options to be configured and administered securely by non-expert personnel. It also operates in kernel space providing the opportunity for catastrophic failure. OpenVPN rejects the complexity of IPSec by using the battle tested SSL TLS protocol and cryptographic libraries to provide equal or better function in a simpler package. OpenVPN also operates in user-space increasing security and stability. Many of the products that claim to be SSL VPNs are actually just SSL gateways operating under the guise of a true VPN. Many of these products open the unsuspecting

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