Creating the user account with user's principal data.
Possibility to search through the distributed all-users database and the possibility to add the chosen users to the contact list.
Sending and receiving messages. Here the encoding and digital signature with public key are used. It guarantees the following:
You will be confident as to who the user is since the digital signature is verified at the message Receipt
Only you will be able to read the message sent to you
As a result of the previous point: if the message is intercepted, its sender cannot be defined without the message decoding. So the fact of the correspondence of two users remains unknown.
The messages will be cashed in the network for some time. So if the addressee is offline at the moment, he will receive his message as soon as he connects
Strong reliability of delivery, since every message travels by a few paths
High speed - the principal transport protocol used is UDP whose speed is superior to TCP's. It is also possible to work through TCP and Proxy
