📄 encryptdes.htm

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<TITLE>DES encryption</TITLE>
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<OBJECT TYPE="application/x-oleobject" CLASSID="clsid:1e2a7bd0-dab9-11d0-b93a-00c04fc99f9e">
	<PARAM NAME="Keyword" VALUE="Encryption, DES">
	<PARAM NAME="Keyword" VALUE="Data Encryption Standard">
</OBJECT>

<H2><A NAME="encryptdes"></A>DES encryption</H2>

<P>If a DES key is specified in the <A
HREF="connproperties.htm">Option/Connections</A> dialogue, it
will be is used to encrypt sound transmitted to that host using
a slightly modified version of the Data Encryption Standard
algorithm (the initial and final permutations, which do not
contribute to the security of the algorithm and exist purely to
deter software implementations of DES are not performed).  In
order to decrypt sound encoded with DES, the connection on the
receiving machine must specify an identical DES key.  The DES
key phrase can be as long as 255 characters.  The actual DES
key is created by applying the
<a href="http://www.fourmilab.ch/md5/rfc1321.html"><B>MD5</B></a>
algorithm to the
given key phrase, then folding the resulting 128 bit digest
into 56 bits with XOR and AND.</P>

<P><i>Speak Freely</i> will continue to correctly receive unencrypted
sound from a given host even if a DES key is specified for the
connection as long as the remote host is transmitting in <i>Speak
Freely</i> <A HREF="protocol.htm">protocol</A>. RTP and VAT
protocols do not permit this, so you must clear the DES key for
the connection to receive unencrypted RTP and VAT
transmissions.</P>

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