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Authentication Methods

The following table shows the available authentication methods and limitations on their use.

	Available	Suitable for	Requires	Requires
	from	scripting	additional	additional
	binaries		software	hardware
Password	x
User public key
- ssh2 keys	x	x
- ssh1 keys	x	x
- PGP keys	x	x	x
Certificates
- software	x		x
- PKCS #11 tokens	x			x
Host-based	x	x
Kerberos5
- client			x
- server			x
RSA securID
- client	x			x
- server			x
PAM
- client	x
- server			x

If Available from binaries is not checked, the authentication method in question can be enabled by compiling from source. See Chapter Authentication for instructions.

Explanation:

1. Use ssh-agent2 or NULL passphrase. Note that in the latter case it is extremely important that no one else can access your private key.
2. Only the OpenPGP standard and programs using it are supported.
3. Only Kerberos5 is supported
4. SecurID tokens
5. RSA ACE/Server or RSA ACE/Agent software
6. Only PAM on Linux and on Solaris 2.6 or later is supported.