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<A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
 <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
 <b>:</b> <EM>Encryption (ECP) layer</EM><BR>
<b>Previous:</b> <A HREF="mpd22.html"><EM>Bundle layer</EM></A><BR>
<b>Next:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A>


<HR NOSHADE>
  <H2><A NAME="23"></A>4.5. Encryption (ECP) layer<A NAME="encryption"></A></H2>
<p>This chapter describes commands that configure the Encryption Control
Protocol (ECP) layer. All of these commands apply to the currently
active bundle.</p>
<p>To use ECP you should enable encryption at the bundle level.
To allow encryption to be negotiated you should enable here some of 
encryption protocols.</p>
<p><b>Note:</b> In PPP, encryption should be handled by the ECP rather than CCP.  
However, Microsoft combined both compression and encryption 
into their ``compression'' algorithm (MPPC), which is confusing.</p>
<p>
<dl>

<dt><b><code>set ecp key <em>string</em> </code></b><dd>
<p>Sets the encryption key.</p>

<dt><b><code>set ecp accept <em>option ...</em> </code></b><dd>
<dt><b><code>set ecp deny <em>option ...</em> </code></b><dd>
<dt><b><code>set ecp enable <em>option ...</em> </code></b><dd>
<dt><b><code>set ecp disable <em>option ...</em> </code></b><dd>
<dt><b><code>set ecp yes <em>option ...</em> </code></b><dd>
<dt><b><code>set ecp no <em>option ...</em> </code></b><dd>
<p>These commands configure various ECP options. Each direction of
traffic (transmit and receive) is independent from the other.
All options default to <code><b>disable</b></code> and <code><b>deny</b></code>.</p>
<p>The <code><b>enable</b></code> and <code><b>disable</b></code> commands determine
whether we desire the corresponding option on received data.
The <code><b>accept</b></code> and <code><b>deny</b></code> commands determine
whether we will allow the peer to request the corresponding option
(which we must enable on our transmitted data).</p>

<p>The <b><code>yes</code></b> command is the same as
<code><b>enable</b></code> and <code><b>accept</b></code>.
The <b><code>no</code></b> command is the same as
<code><b>disable</b></code> and <code><b>deny</b></code>.</p>

</dl>
</p>

<p>The options available at the ECP layer are:</p>
<p>
<dl>

<dt><b><code>dese-bis</code></b><dd><p>This option enables DESE-bis (rfc 2419) encryption.
This algorithm implemented in user-level, so require much CPU power
on fast (&gt;10Mbit/s) links.</p>
<p>The default is disable.</p>

<dt><b><code>dese-old</code></b><dd><p>This option enables DESE (rfc 1969) encryption.
This algorithm implemented in user-level, so require much CPU power
on fast (&gt;10Mbit/s) links.</p>
<p><b>Note:</b> DESE protocol is deprecated. Because of data padding 
to the next 8 octets boundary, required by block nature of DES encryption, 
dese-old option can have interoperability issues with other protocols 
which work over it. As example, it is incompatible with Predictor-1 and 
Deflate compressions.</p>
<p>The default is disable.</p>

</dl>
</p>

 <HR NOSHADE>
<A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
 <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
 <b>:</b> <EM>Encryption (ECP) layer</EM><BR>
<b>Previous:</b> <A HREF="mpd22.html"><EM>Bundle layer</EM></A><BR>
<b>Next:</b> <A HREF="mpd24.html"><EM>Compression (CCP) layer</EM></A>



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