PuTTY is a free and open source network utility that allows you to establish Telnet and Secure Shell (SSH) connections to servers. It is commonly used on Microsoft Windows systms, but is also available for Linux and Apple OS X systems. You can use it for interactive SSH logins where you provide a userid and password to authenticate with an SSH server, but you can also use it for public key-based logins where the server has a public key that is matched against a private key stored on the system from which you are connecting. By a mathematical calculation based on large prime numbers, the public key and private key can be matched with one another as a means of authenticating the login.
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