Nomination in the Competition "ZukunftErfinden 2015":
access method for accessing a protected communication service (4) via a public communication network (3) by means of a secure communication network (2), whereby the secure communication network (2) is based [...] ion network (2), and accessing the communication service (4) via the public communication network (3) using the group key. The present invention further relates to a communication system (1) comprising [...] comprising a secure communication network (2) based on user groups (21), a public communication network (3), a protected communication service (4), and an access server (5) for managing access rights to the co …