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<p>Thank you Kevin and Ken for posting.</p>
<p>In the world of cryptography there are two things that might
arise:</p>
<ul>
<li>An email message might be "encrypted". If it is encrypted,
then most people who somehow come into possession of the email
message would not be able to read it. Only someone who is in
possession of the private decryption key would be able to
decrypt the message and read it.</li>
<li>An email message might be cryptographically "signed". If it
is signed, then the email message contains a cryptographic
signature. The signature permits the recipient of the email
message to confirm (if they wish) that the message has not been
tampered with along the way. The signature also permits the
recipient of the email message to confirm (if they wish) that
the message really came from the person that it claims to have
come from. Another way to say this is that it provides
non-deniability -- the sender cannot deny that he or she was the
sender, because only he or she could have signed it.</li>
</ul>
<p>Most signed email messages also provide to the recipient what is
called the "public key" of the sender. This permits the recipient
R, if they so choose, to send email messages to that sender S with
the protection of encryption. R's email client will likely have
automatically stored the public key of S locally for future use.
So for example R gets ready to send an email to S and R's email
client may encrypt the to-be-sent email message to S. And then
R's email client sends the encrypted email message to S. S uses
his or her private key to decrypt the email message.</p>
<p>Some email messages are both signed and encrypted. I'd guess
that what happens very often is that if a sender of an email
message encrypts it, the sender also signs it.</p>
<p>If anybody sees a posting from me on a listserv, by definition it
is not encrypted. Any email client that says my email posting to
a listserv is encrypted is broken and needs fixing.</p>
<p>Many of my email postings to the listservs are signed. I suppose
what must sometimes happen is that somebody who is reading one of
my postings might have an email client that makes a big mistake in
its interpretation or handling of the cryptographic signature. <br>
</p>
<p>If you were to click around in your email client, very likely you
could find a place where your email client methodically stores all
of the public keys that it has ever received from people like me.
You could look in that place, and you would very likely see a
public key for <a class="moz-txt-link-abbreviated" href="mailto:carl@oppedahl.com">carl@oppedahl.com</a> that was issued by a service
provider called Sectigo and that will expire in October of 2025.<br>
</p>
<div class="moz-cite-prefix">On 2/10/2025 8:19 AM, Kevin Grierson
via E-trademarks wrote:<br>
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<p class="MsoNormal">Ken, <br>
</p>
<p class="MsoNormal">Regarding your post script, occasionally
Outlook shows Carl\u2019s emails as encrypted, and then the message
is blank, but there is an attachment that has the message
itself. This happens with a couple of clients, who claim that
they are not trying to encrypt their emails\u2014perhaps a function
of their email service?</p>
<p class="MsoNormal">kwg</p>
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<p class="MsoNormal"><b><span>From:</span></b><span>
E-trademarks
<a class="moz-txt-link-rfc2396E" href="mailto:e-trademarks-bounces@oppedahl-lists.com"><e-trademarks-bounces@oppedahl-lists.com></a>
<b>On Behalf Of </b>Ken Boone via E-trademarks<br>
<b>Sent:</b> Sunday, February 9, 2025 3:55 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:E-Trademarks@oppedahl-lists.com">E-Trademarks@oppedahl-lists.com</a><br>
<b>Cc:</b> Ken Boone <a class="moz-txt-link-rfc2396E" href="mailto:boondogles@hotmail.com"><boondogles@hotmail.com></a><br>
<b>Subject:</b> Re: [E-trademarks] Applications owned by
same owners no longer examined together?</span></p>
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<p class="MsoNormal"><span>PS - Does anyone else have
any problems viewing postings from Carl? On my
laptop with Microsoft Edge, my email viewer spins
and spins over Carl's postings. I typically switch
to my Fire tablet and forward Carl's posting to
myself to view Carl's posting. Or I switch from
Edge to Chrome. Just me? </span></p>
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