📄 encryptotp.htm

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<TITLE>Key file encryption</TITLE>
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	<PARAM NAME="Keyword" VALUE="Encryption, key file">
	<PARAM NAME="Keyword" VALUE="key file">
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<H2><A NAME="encryptotp"></A>Key file encryption</H2>

<P>A key file is a binary file containing essentially random
data as long as the individual sound packets being sent.  Enter
the full path name of the file in the "Key file" box of the <A
HREF="connproperties.htm">Options/Connection</A> dialogue box
or use the "Browse" button to pop up a file open dialogue to
select the file.</P>

<P>The file you specify as a key file should be at least 512
bytes long and consist of near-random (in the sense of
incompressible) data.  The "<tt>+makerandom=</tt><i>length filename</i>"
option of PGP is an excellent way to generate
such a file.  To securely deliver a copy of the key file to the
person you wish to talk to, encrypt it with their public key
using PGP and send it to them, in ASCII armoured form, via
electronic mail.</P>

<P>Key file encryption is by far the least demanding on your
computer; it requires almost no additional computation.  The
level of security provided, however, is much less than the
other encryption options, and should be viewed as a last resort
alternative to transmitting in the clear if your machine is too
slow to use any other form of encryption.</P>

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

<P>Since key file 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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