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OpenVPN
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〔(【引用サイトリンク】url=http://openvpn.net/index.php/open-source/documentation/security-overview.html )〕 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).〔LinuxSecurity.com - (OpenVPN: An Introduction and Interview with Founder, James Yonan )〕
OpenVPN allows peers to authenticate each other using a pre-shared secret key, certificates, or username/password. When used in a multiclient-server configuration, it allows the server to release an authentication certificate for every client, using signature and Certificate authority. It uses the OpenSSL encryption library extensively, as well as the SSLv3/TLSv1 protocol, and contains many security and control features.
OpenVPN has been ported and embedded to several systems. For example, DD-WRT has the OpenVPN server function. SoftEther VPN, a multi-protocol VPN server, has an implementation of OpenVPN protocol.
PrivateVPN is a a commercial spin-off of OpenVPN Technologies, a VPN service provider based in the US that, unusually, charges according to data transferred rather than per month.
==Architecture==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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