📄 encryptidea.htm

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<TITLE>IDEA encryption</TITLE>
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	<PARAM NAME="Keyword" VALUE="International Data Encryption Algorithm">
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<H2><A NAME="encryptidea"></A>IDEA encryption</H2>

<P>If an IDEA 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 with
the International Data Encryption Algorithm (IDEA).  In order
to decrypt sound encoded with IDEA, the connection on the
receiving machine specify an identical IDEA key.  The IDEA key
phrase can be as long as 255 characters.  The actual IDEA 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 to create the 128 bit IDEA key.</P>

<P>IDEA encryption is substantially faster and generally
considered to be much more secure than <A
HREF="encryptdes.htm">DES encryption</A>.  However, IDEA is
newer, has not been formally adopted by governments, and is <A
HREF="encryptpatent.htm">patented</A>, restricting its
commercial use.  If your CPU is fast enough, you can enable any
combination of IDEA, DES, and key file encryption.  But since
PGP uses IDEA to transmit message bodies, if you rely on  PGP
to exchange keys with other parties, the fundamental security
of your voice link rests upon IDEA alone.</P>

<P>Cipher block chaining is used within each sound packet, but
not from packet to packet.  If that were done, loss of a single
packet would render the entire rest of the conversation
unintelligible.</P>

<P><i>Speak Freely</i> will continue to correctly receive unencrypted
sound  from a given host even if an IDEA key is specified for
the connection.</P>

<P>The IDEA encryption algorithm is patented and may not be
used commercially without a license; see <A
HREF="encryptpatent.htm">"Patent issues"</A> for further
details.</P>

<P>Since IDEA encryption is not specified as a part of the <A
HREF="protocol.htm">RTP and VAT protocols</A>, it can be used
only when transmitting in <i>Speak Freely</i> protocol.</P>

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