The OATH Toolkit makes it easy to build one-time password
 authentication systems. It contains shared libraries, command line
 tools and a PAM module. Supported technologies include the
 event-based HOTP algorithm (RFC4226) and the time-based TOTP algorithm
 (RFC6238). OATH stands for Open AuTHentication, which is the
 organization that specify the algorithms. For managing secret key
 files, the Portable Symmetric Key Container (PSKC) format described in
 RFC6030 is supported.
 .
 This package contain a PAM module to authenticate users against
 a local file-based OATH database.