The OATH Toolkit contains a shared library, command line tool
and a PAM module that makes it possible to build one-time
password authentication systems. Supported technologies include
the event-based HOTP algorithm and the time-based TOTP algorithm.
OATH is the Open AuTHentication organization which specify
the algorithms.

The components included in the package is:

- liboath:  A shared and static C library for OATH handling.
- oathtool: A command line tool for generating and validating OTPs.
- pam_oath: A PAM module for pluggable login authentication for OATH.

WWW: http://www.nongnu.org/oath-toolkit/