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1.6. Client Key Authentication

Public key authentication is one option available to users to prove their identity to a remote host. Below is its checklist.
Required Config Lines
MustDefineKey Size must be 2048 or larger.
MustDefineAll private keys must be password protected.
MustDefineAll public keys must have a comment to the owners email address or a unique identifier if it is needed.
ShouldDefineAll private keys shouldbe RSA.A great deal of debate has happened concerning DSA vs RSA vs both and as the writer, I've picked RSA