Where can I find a really secure messenger?

Question

Messengers

Hello!
I need a secure messenger with the following requirements:
1. Clients for the largest number of platforms
2. Secure connections
3. Running a server inside the company
4. Sending files
5. Group text, audio, video chats
6. Viewing sent images in a chat
7. Message history
Can Has anyone come across anything similar?
Of course, I used the search and found tox.im. But the project, apparently, is still quite damp.
Thank you!

Answer 1

The only way to get

really secure messenger

- write it yourself.
But, since each participant in the dialogue in this case will face a crisis of confidence and the need to write their own messenger, communication will not work.
Otherwise, the choice depends on who you really want to protect yourself from.
Any closed-source software and protocol is vulnerable by default.
Open source software is just as vulnerable, because Even with a full code audit, there is no guarantee that you haven't missed an exploit or hole.
As a result, the messenger faces the task of becoming the not-the-weakest link in the chain of ways to get your information. And in most cases, tox.im, and the notorious telegram, and other "quite raw" projects cope with this task.

Answer 2

Protected manager of Cactuz
cactuz.im

Answer 3

Maybe the VIPole secure messenger is suitable for you.
Here is more about its functions
https://www.vipole.com/ru/features
Sending files, video-voice chats are there, you can also install your own server.
Try the free version first

Answer 4

all of the above is matrix im https://matrix.org/