Nomination in the Competition "ZukunftErfinden 2015":
public communication network (3) by means of a secure communication network (2), whereby the secure communication network (2) is based on user groups (21), comprising the steps of defining an access group [...] communication network (2), generating a group key for all members of the access group, providing the group key to a member of the access group via the secure communication network (2), and accessing the [...] invention further relates to a communication system (1) comprising a secure communication network (2) based on user groups (21), a public communication network (3), a protected communication service (4) …
