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What is SSH (Secure Shell)?

A cryptographic network protocol for secure remote login and command execution over an unsecured network.

SSH provides encrypted communication between two computers. It replaces insecure protocols like Telnet and rlogin. SSH uses public-key cryptography for authentication and symmetric encryption for data transfer.

Common uses include remote server management, file transfer (via SCP/SFTP), port forwarding, and tunneling. The default port is 22.

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