Military and government institutions need security services for storing and exchanging classified information among them. Security of such information is important for independence of the State. At present, cryptography provides a lot of methods for information security. A one-time pad cipher may be used to ensure perfect (unconditional) security. There are many ciphers and other cryptographic transformations, which are not perfect, but ensure conditional security adequate to needs. All cryptosystems require keys and other crypto materials. These keys should satisfy numerous conditions. The basic is randomness. One of the best sources of random bit sequences used in the production of keys for special cryptosystems is a hardware generator. Now we have an electronic device, where it is possible to generate binary random sequences with the potential output rate of 100 Mbit/s. It gives us the capability of building an efficient key generation equipment for the cryptosystems to rely on the one-time pad cipher, where we need very long keys and for those based on symmetric or asymmetric transformations where many relatively short keys are needed.

Assured security is the desirable feature of modern cryptography. Most of modern cryptography primitives have no provably secure constructions. Their safety is defined on the basis of well-known in the given time cryptanalytic attacks. The duplex construction equipped with one ideal permutation and appropriate security parameters is suitable for building provably secure cryptographic primitives. The constructions can be used for unclassified information of different sensitivity levels protection. Some of them can secure classified information up to the "TOP SECRET" level. The applications based on the duplex construction can be used for key wrapping, authenticated encryption and can work as a pseudo-random bit sequence generator. They are not covered by any known intellectual property.

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