Data network-based system

摘要

The invention relates to a data network-based system (1') which is adapted for data communication and which includes a number of users (2) belong-ing to a first category and a number of users (3) belonging to a second category. A first user (2) belonging to the first category is adapted to use a chosen security protocol (20, 21) to establish a secure session with a second user (3) belonging to said second category, and subsequent to positive authentication allow data com-munication to pass through a firewall (6). A means (8) pre-coupled to the firewall (6) is adapted to establish the identity of the first user through the medium of a handshake procedure (21) belonging to the security protocol (20), and to allow messages to be forwarded from the first user to the second user belonging to said secure session in response to accepted authentication.