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<th colspan="3" align="center">LPRng-HOWTO: 1 Apr 2002
(For LPRng-3.8.10)</th>
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<td width="80%" align="center" valign="bottom">Chapter
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<div class="SECT1">
<h1 class="SECT1"><a name="AUTHREF">17.7.
Authentication</a></h1>
<p>One of the major problems in a print spooler system is
providing privacy and authentication services for users. One
method is to construct a specific set of protocols which will
be used for providing the privacy or authentication; another
is to provide a simple interface to a set of tools that will
do the authentication and/or encryption.</p>
<p><b class="APPLICATION">LPRng</b> provides native support
for the MIT Kerberos 4 extensions and Kerberos 5
authentication.</p>
<p><b class="APPLICATION">LPRng</b> has native support for
the PGP (Pretty Good Privacy) program and can sign and
optionally encrypt command and responses between servers and
clients. Due to legal restrictions, an external PGP program
must be used for this purpose.</p>
<p>A simple MD5 hash based authentication scheme is also
provided as an example to illustrate how new or different
authentication methods can be adddd.</p>
<p>Finally, <b class="APPLICATION">LPRng</b> provide a
general purpose interface allowing users to insert their own
authentication methods, either at the program level or at the
code level.</p>
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