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Dec
28
comment SSH authentication: either SSH keys or one time password
Sorry to add another comment, but I found Duo Security which also looks like a great optw/dual factor authentication option.
Dec
28
comment SSH authentication: either SSH keys or one time password
A more active project is Google Authenticator.
Dec
28
comment SSH authentication: either SSH keys or one time password
Also, Barada is another solution that looks promising; instead of paper one-time passwords, it uses a smartphone to generate the password from a PIN you supply. If you are on a trusted system you can just enter your standard password.