SSHprotokollaa

SSHprotokollaa, also known as Secure Shell, is a cryptographic network protocol used for operating network services securely over an unsecured network. It provides a secure channel over which applications can communicate. The most common use of SSH is for remote login and command execution. It encrypts the connection between the client and the server, preventing eavesdropping and man-in-the-middle attacks.

SSH operates on the TCP/IP network model. It typically uses port 22 for its operations. The protocol uses a combination of public-key cryptography and symmetric-key cryptography to establish a secure connection. Key exchange methods are used to agree upon a shared secret key for encrypting the session. Authentication can be done using passwords or public key authentication. Public key authentication is generally considered more secure as it relies on cryptographic keys rather than easily guessable passwords.

Beyond remote command-line access, SSH can also be used for secure file transfers through protocols like SFTP (SSH File Transfer Protocol) and SCP (Secure Copy Protocol). It can also tunnel other network protocols, allowing for secure browsing or other application traffic over an encrypted connection. SSH is a fundamental tool for system administrators and developers for managing and interacting with remote systems securely. Its widespread adoption makes it a cornerstone of modern network security practices.