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What Is Secure Shell?

Secure shell is a common term used to describe a secure remote login protocol. Anyone using the term secure shell is also referring to the SSH protocol. In particular, the SSH protocol encrypts traffic and permits tunneling; that is, port forwarding over a secure channel.

There are two SSH protocols: SSH1 and SSH2. As you might have guessed, SSH1 is the original protocol, and SSH2 is a later development. Currently, SSH2 is the protocol under development. Where possible, use the SSH2 protocol rather than the SSH1 protocol. However, there are still Unix machines out there running only SSH1 servers. Consequently, we will discuss using both protocols. In most areas, the usage is similar.


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