In case you use OpenPGP on a smartphone ...

Stefan Claas sac at
Sat Aug 15 18:58:30 CEST 2020

Stefan Claas wrote:

> I did a bit research and purchased today the IMHO beautiful Doro Primo 413
> dumb phone (for elderly people) and it includes a USB C to USB charger/data
> cable, which then can be connected to an offline Notebook.
> Once my batteries are charged, later today, I will try out the following:
> Preparing a PGP message, converting it to JAB-Code and then transfer the
> .png image( less than 300 KB, due to German Telefon Carrier specs.) to the
> dumb phone. 
> Finally I will prepare an MMS and load the image and send the message for a
> test to my smartphone, for later retrival, to see if everything went well.

Ok, worked! :-) SHA256 hashes matched from both devices.

Only thing I have to do is purchasing an sd memory card, because the regular
memory is to low.


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