In Vienna, running quantum cryptographic systems

In Austria, running quantum cryptographic systems, precluding the possibility of interception of communications, said BBC News. The project is sponsored by the European Union.

The new system is a network of six sites in Vienna and the nearby town of Outdoor Sports. To transfer data used 200 kilometers conventional Fiber-optic cables and assemblies equipment.

Most argued that the quantum encrypting makes the system virtually nevzlamyvaemoy. This is not entirely correct. Quantum systems are based on the Heisenberg uncertainty principle and can determine the presence of a third party (for example, the eavesdropper), found an increase in the number of transmission errors. Vienna, in this case the network stops working. This property makes the interception of communications impossible.

It's really nevzlamyvaemy code (the system, which demonstrated the absolute reliability), was invented in 1917. This so-called single-notebooks (notebooks contain keys to the codes). In a truly random manner that matches the length of the text and applied once, it is impossible to decipher. But such a notebook, you can steal or copy, which is the weakness of traditional encryption schemes.