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Quantum cryptography or more precisely quantum key distribution (QKD) is a new technology which gets a high level of attention today worldwide. The possibility to exchange information in a provable secure way is a milestone in communication history. The main problem in QKD is the range limitation between the communication partners Alice and Bob. Several experiments have shown that the distance between Alice and Bob can be enhanced. Some of these experiments used optical fibers; others were based on free space technologies. But beyond that it is now possible to build communication networks based on QKD. Thus, not only Peer to Peer connection has to be used but it is now possible to build modern communication structures.