Secure messengers, who knows what?

Question

Information Security

Advise the safest messenger, I know:
Telegram - https://telegram.org/
SafeUM - https://safeum.com/ru/
What else is there??

Answer 1

It depends on what is meant by security: encryption of dialogues, like Durov’s, or an application password-protected from his wife :)

Answer 2

What/who are we protecting ourselves from?
And that depends on the choice.

Answer 3

Telegram has already been broken several times.
Never heard of Seifum. Yes, this is the first time I've heard of it :)

Answer 4

https://www.wire.com/
TextSecure Private Messenger

Answer 5

If you do not need to be tied to the device, there is no absolute messenger. If linked to a personal phone, then "ViPNet Client for Android", all traffic is packed inside. As a messenger, a corporate mail server, no?
Similarly, "Continent TLS VPN".
There are certified versions - which "can be considered" more than safe :)
True, everyone will have to buy a phone.

Answer 6

So many answers, but no one remembered Tox.

Answer 7

RetroShare easily breaks through NAT
Tox messenger easily breaks through double NAT
XMPP with OTR
JAMI is still damp but you can use
all of the above is open source I personally tested all these programs