Re: Helpful tips to make the above concept better welcome.
How else could I have done that? Bear in mind the recipient was a "normal" and dosent have their own ftp server set up or anything like that.
Without resorting to iOS devices:
- Telegram. Russian servers but relatively open and reviewed, free because gazillionaire is sponsoring it to annoy someone.
- Signal. US origin, but from one of the few people who I would trust in the security business. Open Source, works well, no iPad version.
- Threema. IMHO just about the best for messaging, a little bit behind on secure calls (will not do secure calls on older iOS devices, Telegram and Signal do). On a par with Signal, but of Swiss origin, like Signal developed by someone who has seriously earned his spurs in the security world. Costs a tiny bit of money, which seems to be enough of a barrier to ensure it's more used by people clued up on security.
Does that help? None of the above copy your address book, instead they use hash functions to match up users.
Biting the hand that feeds IT
