message signature types

[auto15963931]

Charly Avital:
> auto15963931 <jv92pc$ct5$1 at dough.gmane.org> July 31, 2012 2:47:22 PM wrote:
>> If this is the wrong place to ask, please point me in the right
>> direction. Where can I learn more about importing, if such a thing is
>> even done this way, and making use of message signatures which utilize
>> an "smime.p7s" file? I got a message from someone who uses this, and I
>> need to learn about verifying and downloading from a keyserver files
>> like this. Especially important for me is learning how to check whether
>> it had been revoked, etc.  Where is a support group for this sort of
>> signature if this is not it? Thanks.
> 
> S/MIME = Secure Multipurpose Internet Mail Extensions is a standard for
> public key encryption and signing of e-mail encapsulated in MIME.
> 
> It achieves goals that are similar to GnuPG's but uses different means.
> 
> The use of GnuPG requires the installation of GnuPG software, and some
> kind of module that will enable interaction between that software and
> the e-mail client one is using. GnuPG per se enables its user to
> generate and manage certificates (aka keys).
> 
> S/MIME does not require the installation of any such software but needs
> to obtain and install a certificate/key that is issued by a Certificate
> Authority (CA). The certificate that is issued by the CA of your choice
> has to be imported into your e-mail client (if it has S/MIME capability)
> or into your browser.
> 
> You might try <http://www.comodo.com>.
> 
> I am sure members of this list will provide more accurate information.
> 
> Charly
> OS X 10.8 (12A269}  MacBook Intel C2Duo 2GHz-GnuPG 1.4.12-MacGPG2-2.0.17-9
> Thunderbird 14.0 Enigmail 1.5a1pre (20120727-2257)
> 

So the last question is just how do I go about checking whether one of
these smime.p7s certificates has been revoked. What is the process of
revocation in general? Thanks.