System and method for exchanging data between a first data processing system and a second data processing system via an at least partly public communication network

摘要

Communication system for exchanging data, via a communication network at leastpartly accessible to the public, between a first data processing system and asecond data processing system, comprising a first data processing system adaptedto communicate according to a communication protocol, wherein the first dataprocessing system is linked via a first coupling to the communication networkat least partly accessible to the public, and a second data processing system,comprising at least one data processing system, adapted to communicate accordingto the communication protocol, wherein the second data processing system islinked via a second coupling to the communication network at least partly accessibleto the public, characterized in that at least one of the couplings comprises adata connection inaccessible to data traffic according to the communicationprotocol.