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OpenSSH on external computer?

code4 asked
Last Modified: 2014-05-02
Is it possible to use a third computer to do authentication.

This is the scenario:

Computer1 wants an SSH connection to Computer2

What happens is:

Computer1 connects to Computer3, running OpenSSH.
Computer3 authenticates Computer1 and Computer 2.

The result is an SSH connection between 1 and 2 authenticated by 3.

Is this possible?
If so, how to set it up on Ubuntu?

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