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yubikey-val 2.38-2
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== YubiKey OTP Validation Server ==

The YubiKey Validation Server (YK-VAL) is a server that validates
Yubikey One-Time Passwords (OTPs).  YK-VAL is written in PHP, for use
behind web servers such as Apache.

General
-------

The server implements the Yubico API protocol as defined in
doc/ValidationProtocol* and further documentation is also available in
the doc/ subdirectory.

This server talks to a KSM service for decrypting the OTPs, to avoid
storing any AES keys on the validation server.  One implementation of
this service is the https://developers.yubico.com/yubikey-ksm[YubiKey-KSM],
and another implementation using the YubiHSM hardware is
https://developers.yubico.com/python-pyhsm[PyHSM].

Note that version 1.x is a minimal centralized server. Version 2.x is
a replicated system that uses multiple machines.

License
-------

The project is licensed under a BSD license.  See the file COPYING for
exact wording.  For any copyright year range specified as YYYY-ZZZZ in
this package note that the range specifies every single year in that
closed interval.