OpenVPN

OpenVPN is an open-source protocol used to create secure point-to-point or site-to-site connections in routed or bridged configurations. It utilizes SSL/TLS for key exchange and can traverse firewalls and network address translators (NATs). Developed by James Yonan, the first release was in 2001. OpenVPN supports both encryption and authentication mechanisms to ensure secure communications over the internet or private networks.

OpenVPN, created by James Yonan and first released in 2001, is an open-source VPN protocol renowned for its flexibility and robust security features. It leverages SSL/TLS for encryption and key exchange, making it compatible with various cryptographic algorithms. By using a custom security protocol that utilizes SSL/TLS, OpenVPN can securely traverse network address translators (NATs) and firewalls, an essential feature for ensuring connectivity in restrictive network environments. This protocol supports a wide array of authentication methods, including pre-shared keys, certificate-based authentication, and username/password combinations. Its ability to adapt to both UDP and TCP transmission protocols allows it to balance between speed and reliability based on the network context. OpenVPN's open-source nature ensures continuous security auditing and updates by a broad community of developers, enhancing its reliability and security. Moreover, its cross-platform compatibility makes it suitable for various operating systems, including Windows, macOS, Linux, Android, and iOS.