SSH Keys and Public Key AuthenticationOpenSSH does have support for certificates as well, but it is likely that you are not using this support. On general purpose computers, randomness for SSH key generation is usually not a problem. If you generate a key with OpenSSH using ssh-keygen with the default options, it will work with virtually every server out there.
From Wikipedia, the free encyclopedia. Enter passphrase empty for no passphrase: This operation is only supported for RSA1 keys. Private keys are normally already stored in a PEM format suitable for both. Host keys are just ordinary SSH key pairs.
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ssh-keygen file format From Links Given Below.