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        <th colspan="3" align="center">LPRng Reference Manual: 24
        Sep 2004 (For LPRng-3.8.28)</th>
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        <td width="80%" align="center" valign="bottom">Chapter 19.
        RFC 1179 - Line Printer Daemon Protocol</td>

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  <div class="SECT1">
    <h1 class="SECT1"><a name="AEN10753" id="AEN10753">19.10.
    Authenticated Transfer</a></h1>

    <p>RFC1179 does not provide any authentication or encryption
    mechanism for the transfer of jobs or commands to the <b class=
    "APPLICATION">lpd</b> print server. The Authenticated Transfer
    operation was added to allow an encrypted or authenticated
    transfer of print jobs or commands.</p>

    <p>Since there are various restrictions on the incorporation of
    authentication facilities into programs, <b class=
    "APPLICATION">LPRng</b> supports authentication by providing a
    simple interface to encryption programs.</p>

    <p>The idea is that when authentication is required when
    sending a job, <b class="APPLICATION">LPRng</b> will generate a
    block transfer job as described for the <a href=
    "sendblockformat.htm">Block Job Transfer</a> operation, and
    then invoke a set of programs to encryt and transfer the file,
    and encrypt and transfer the returned status.</p>

    <p>Similarly, when sending a command, the command information
    will be placed in a file and the encrypted file will be
    transferred.</p>

    <p>This technique means that the programs and support to do
    encryption are external to <b class="APPLICATION">LPRng</b>,
    and can use any type of method that they choose to implement
    the secure and/or authenticated transfer.</p>

    <p>See <a href="authref.htm">Authentication and Encryption</a>
    for details on the authentication interface.</p>
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