OpenVPN is tightly bound to the OpenSSL library, and derives much of its crypto capabilities from it. OpenVPN supports conventional encryption using a pre-shared secret key (Static Key mode) or public key security (SSL/TLS mode) using client & server certificates. OpenVPN also supports non-encrypted TCP/UDP tunnels. OpenVPN is designed to work with the TUN/TAP virtual networking interface that exists on most platforms. Overall, OpenVPN aims to offer many of the key features of IPSec but with a relatively lightweight footprint.
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