MESSJANGE

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HTTP + push notifications. This is when you receive a notification that a message has arrived, and the server responds to you only after you have opened the application.




Socket-based Extensible Messaging Protocol (XMPP). This protocol is used more often because you always stay connected to the server and if the connection fails, you go offline.

Most popular messengers are based on 2 types of secure messaging protocols:

Any secure messenger is built on the principle of end-to-end encryption, which looks like this:

When the first user writes to the second user, the public key is retrieved and used to encrypt the message so that it is accessible only through the private key. The message is then sent to the second user through the server and decrypted by him using the private key.

Two users start a dialog. This event generates 2 sets of keys:
private key (left on the user's device);
The public key (stored on the service provider's server).

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Deleting Messages
The ability to delete messages is another important piece of the puzzle. Although many messengers have a message deletion feature, you cannot be 100% sure that messages are actually deleted from the application servers and databases.

Metadata is also considered a problematic element in privacy compliance. They are used to identify users and their credentials.

Transparency for secure messengers sounds twofold. On the one hand, you have to have certain terms of service spelled out, stating your intention to provide a secure platform with privacy protection for the user.

What functions are there?

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