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Topal — Features
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<h1>Topal — Features</h1>
<p>Copyright © 2001–2018 Phillip J. Brooke</p>
<p>Topal is a ‘glue’ program that links
<a href="http://www.gnupg.org">GnuPG</a>
and
<a href="http://www.washington.edu/pine/">Pine</a>/<a href="http://www.washington.edu/alpine/">Alpine</a>/<a href="http://sourceforge.net/projects/re-alpine/">Re-Alpine</a>.
It
offers facilities to encrypt, decrypt, sign and verify emails,
including inline OpenPGP, MIME/OpenPGP and S/MIME. It can also be
used directly from the command-line.
</p>
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<ul>
<li> Multiple inline PGP blocks can be processed in display filters.
</li>
<li> Decryption and verification output can be cached to reduce the
number of times a passphrase is entered. This also helps when
secret keys aren't always available, at the expense of storing
decrypted output.
</li>
<li> MIME/OpenPGP (RFC2015/RFC3156) multipart messages can be sent
and received. Depending on configuration, this might involve
procmail, using <tt>sendmail-path</tt> or patching Alpine.
</li>
<li> The deprecated application/pgp content-type can be sent and received.
</li>
<li> S/MIME messages can be sent and received if <tt>gpgsm</tt> is
available. (<tt>openssl</tt> is also used in some circumstances, but
<tt>gpgsm</tt> is still required.)
</li>
<li> Topal can be used as Alpine's <tt>sendmail-path</tt> command.
</li>
<li> Topal has a remote sending mode (a server and a means of
accessing the server) for reading email on a distant computer via
SSH with secret keys on the local computer.
</li>
<li> A range of mechanisms for selecting keys for both self and recipients.
</li>
<li> There is a high level of configurability (although the
configuration interface does not expose all of it; you might have to
edit <tt>.topal/config</tt>).
</li></ul>
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<p>See the documentation in <a href="topal.pdf"><tt>topal.pdf</tt></a>
for further details.</p>
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