📄 encryptpgp.htm

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<TITLE>PGP key exchange</TITLE>
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	<PARAM NAME="Keyword" VALUE="Encryption, PGP">
	<PARAM NAME="Keyword" VALUE="public key encryption">
	<PARAM NAME="Keyword" VALUE="Encryption, IDEA">
	<PARAM NAME="Keyword" VALUE="PGP">
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<H2><A NAME="encryptpgp"></A>PGP key exchange</H2>

<P>If PGP is installed on your computer, <i>Speak Freely</i> will
cooperate with it to provide the convenience of public key
encryption.  To encrypt sound to one or more users on your PGP
public keyring, enter enough of their user name(s) to uniquely
identify them in the "PGP user name(s)" field of the <A
HREF="connproperties.htm">Option/Connections</A> dialogue. 
When you click OK to close the dialogue, <i>Speak Freely</i> generates
a 128 bit random session key for subsequent communications,
invokes PGP in an MS-DOS window to encrypt it with the public
key(s) of the named user(s), and transmits it to the host or <A
HREF="multicasting.htm">multicast group</A> the connection
addresses.  Sound packets sent subsequently to that connection
are IDEA encrypted (the same algorithm PGP uses for message
bodies) using the session key.  The ability to encrypt a
session key with more than one user's public key allows you to
transmit securely to multiple subscribers to a <A
HREF="multicasting.htm">multicast</A>.</P>

<P>When a session key is received from a remote host, PGP is
invoked to decrypt it using your secret key.  If you haven't
specified your secret key pass phrase using the <tt>PGPPASS</tt>
environment variable, you'll have to type the pass phrase in
the MS-DOS window in which PGP is running.  See the discussion
of the security risks created by the undeniably convenient
<tt>PGPPASS</tt> variable in Phil Zimmerman's <I>" The Official PGP
User's Guide"</I> cited in the <A
HREF="bookshelf.htm">bookshelf</A>.</P>

<P><i>Speak Freely</i> invokes PGP via the <tt>SFPGP.PIF</tt> file in
<i>Speak Freely</i>'s release directory.  If you'd like to
change the modes used for running PGP (for example, to use
full-screen mode instead of an MS-DOS window), edit this file
with the PIF editor and select the modes you prefer.  If no
<tt>SFPGP.PIF</tt> file is found, <i>Speak Freely</i> attempts to run
PGP directly, using whatever default modes you've set for
MS-DOS programs launched by Windows applications.</P>

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

<P>PGP key exchange and its subsequent IDEA encryption are
independent of, and can be used in conjunction with, the other
secret key encryption options provided by <i>Speak Freely</i>. 
There's little to be gained in security and everything to be
lost in convenience by combining secret and public key
encryption, but if you want to for some reason, you can.</P>

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

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