[MlMt] GPG Encryption + Signing

[Eric Sharakan]

Hi Stephan, I do have GPGSuite installed (2022.1), and your emails 
generate a red banner at top that says:

OpenPGP: No public key could be found for verifying the message 
signature

I think that might be part of your problem.

-Eric

On 24 Apr 2022, at 17:21, Stephan Bösebeck wrote:

> Just an addition: when reading my last email in canaryMail for iOS (or 
> Mac) it states "invalid signature".
>
>
>
> On 24 Apr 2022, at 23:17, Stephan Bösebeck wrote:
>
>> Hi Henry,
>>
>> because the mail for this mailinglist was not encrypted, it was only 
>> signed. So you can check, if the mail was tempered with on the way to 
>> you or if it is the same, as I sent it.
>>
>> You cannot encrypt an email to more than one recipient with PGP. 
>> you'd have to encrypt it for every recipient and send them separately 
>> - so GPG/PGP does not work for mailinglists.
>>
>> It works using "public key" encryption. In a nutshell, you create two 
>> keys, one is private, one is public. With the public key emails can 
>> be _encrypted_ for you and only _decrypted_ with the private key.
>>
>> It's a bit off-topic. But if you want to know more about that, I'm 
>> happy to help ;-)
>>
>> Stephan
>>
>> On 24 Apr 2022, at 23:12, Henry Seiden wrote:
>>
>>> Stephen,
>>>
>>> So, why can I read it, without OpenPGP installed?
>>>
>>> Respectfully,
>>>
>>> Henry Seiden
>>> - -
>>> Techworks Pro Co.
>>> E: info<at>techworkspro<dot>com
>>> W: http://techworkspro.com
>>>
>>> On 24 Apr 2022, at 17:08, Stephan Bösebeck wrote:
>>>
>>>> Hi Henry,
>>>>
>>>> in your case, the GPG-Support seems not to be installed on your 
>>>> mac. You need to install GPGSuite for GPG to work.
>>>> if it works, the banner should be green with the text: `OpenPGP: 
>>>> This message is trusted to have been signed by the sender (EMAIL).`
>>>>
>>>> So, unfortunately, your error is not related to mine. In my case, 
>>>> MailMate always shows the correct banner. But other Mail-Clients 
>>>> with PGP/GPG-Support show the signature to be false or invalid.
>>>>
>>>> Cheers,
>>>>
>>>> Stephan
>>>>
>>>> On 24 Apr 2022, at 23:04, Henry Seiden wrote:
>>>>
>>>>> Hey Stephan,
>>>>>
>>>>> Funny, but I get the same message in Mailmate on this message, 
>>>>> even though it seems I can read (all of) the contents?!?
>>>>> Your message shows the following banners at top, which says, 
>>>>> “OpenPGP unable to locate the command (gpg) needed…” (in red 
>>>>> background)
>>>>> And the banner below that, “Verifying OpenPGP message 
>>>>> signature…” (on a yellow background).
>>>>>
>>>>> Are these clues to what you are seeing?
>>>>>
>>>>> Respectfully,
>>>>>
>>>>> Henry Seiden
>>>>> - -
>>>>> Techworks Pro Co.
>>>>> E: info<at>techworkspro<dot>com
>>>>> W: http://techworkspro.com
>>>>>
>>>>> On 24 Apr 2022, at 16:27, Stephan Bösebeck wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I have some trouble using the GPG encryption support in MailMate. 
>>>>>> I'll try to explain:
>>>>>> I created an encrypted email, sent it to me and tried to decrypt 
>>>>>> it on iOS using different mechanisms, iPGMail and CanaryMail - 
>>>>>> both worked fine.
>>>>>>
>>>>>> I tried the same with an encrypted and signed Email and both 
>>>>>> tools told me, the signature could not be verified... Mailmate 
>>>>>> itself tells, all the signature is valid.
>>>>>>
>>>>>> Does anybody have the same issue and/or some solution? It is not 
>>>>>> really pressing, but I'd like to use encryption / signature more 
>>>>>> often if possible...
>>>>>>
>>>>>> Cheers,
>>>>>>
>>>>>> Stephan
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