Mailinglist Archive

SSH User Identities
by Brian Hatch
last updated November 3, 2004

OpenSSH supports more than just simple passwords for authentication. It
can be configured to use PAM (Pluggable authentication modules),
Challenge/Response protocols, Kerberos authentication, authenticated
host-based trust[1], and there are even patches for other methods, such
as X509 keys. However the most popular alternate authentication method
is Identity/Pubkey authentication.

http://www.securityfocus.com/infocus/1810