OpenSSH - Open Source SSH Client and Server

OpenSSH provides users with the ability to remotely access servers and other network devices securely using the SSH protocol. This protocol ensures that all data transmitted over the network is encrypted, thereby safeguarding against eavesdropping, connection hijacking, and other malicious attacks. The suite includes essential tools such as `ssh` for remote login, `scp` for secure file copying, and `sftp` for secure file transfer, among others.

Key management is another critical aspect of OpenSSH, with tools like `ssh-add`, `ssh-keysign`, `ssh-keyscan`, and `ssh-keygen` allowing users to manage and generate authentication keys. These keys provide a more secure alternative to traditional password-based authentication, reducing the risk of brute-force attacks and unauthorized access.

The server-side components of OpenSSH, such as `sshd` (the SSH daemon), `sftp-server`, and `ssh-agent`, offer administrators fine-grained control over server configurations and user permissions. This level of control is crucial for maintaining the integrity and security of remote systems.

Despite its widespread use and critical role in maintaining secure networks, OpenSSH is developed by a relatively small team and relies on community support for funding. Contributions to the project can be made through the OpenBSD Foundation, helping to ensure the continued development and enhancement of this vital security tool.