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SSH or Secure SHELL is the most popular and trusted UNIX-based cryptographic network protocol. It can be used for secure data communication, remote server logins, remote command execution, and many other secure network services between two networked servers. Normally, password authentication is used to connect to a remote server via SSH. In this blog tutorial we will show you how to login to a remote Linux VPS without password, using SSH keys. This method is more secure than using a password.