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Two-Factor Authentication Module that uses Google Authenticator
http://code.google.com/p/google-authenticator/

The Google Authenticator project includes implementations of one-time passcode
generators for several mobile platforms, as well as a pluggable authentication
module (PAM). One-time passcodes are generated using open standards developed
by the Initiative for Open Authentication (OATH) (which is unrelated to OAuth).

These implementations support the HMAC-Based One-time Password (HOTP) algorithm
specified in RFC 4226 and the Time-based One-time Password (TOTP) algorithm
specified in RFC 6238.

The PAM module can add a two-factor authentication step to any PAM-enabled
application. It supports:
* Per-user secret and status file stored in user's home directory
* Support for 30-second TOTP codes
* Support for emergency scratch codes
* Protection against replay attacks
* Key provisioning via display of QR code
* Manual key entry of RFC 3548 base32 key strings

Source Files (show merged sources derived from linked package)

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