This guide shows you how you can enable S/KEY one-time password authentication on your Arch.
Install the following packages from the AUR:
(As of today 2010-05-17 packages does not seem to support x86_64 but there is posted a fix on comments of opie-client)
Config pam module
In /etc/pam.d tweak config files for wanted logins. I tweaked sshd and sudo. Do the following to selected files:
auth required pam_unix.so change to (note order)--> auth sufficient pam_unix.so auth sufficient pam_opie.so
If you want to use SSH, change ChallengeResponseAuthentication to yes in /etc/ssh/sshd_config
Create an OTP key
As your user (no root), run:
# opiepasswd -c
After entering a passphrase you get your OTP key:
ID busk OTP key is 499 fe6839 MIRE MORE ODE DOME REAM
Get yourself some passwords
# opiekey -n 20 499 fe6839
OR alternative way for Java-enabled mobile phone owners: Get VeJotp, It's free and you can generate passwords on the run.
Now, when you ssh to your box, hit Enter to the password prompt and you will be prompted for onetime password.
This guide is based on