Stacks of quantum cryptography protocols.

In the paper the stack of protocols of quantum key distribution, based on the protocol with single qubits transmission (BB84 protocol), is in details analysed. Based on this analysis the full protocols stack of quantum secure direct communication on a basis of the ping-pong protocol is developed. The developed stack includes such basic protocols: privacy amplification, error correction coding, and quantum information transfer. At the same time developed stack of protocols of quantum secure communication is suitable at use of any variant of the ping-pong protocol as the base. The basic differences between stacks of protocols of quantum key distribution and quantum secure direct communication, which are caused by different purpose of these protocols, different types of the transferred information and accordingly different requirements to their security are considered. .. [ABSTRACT FROM AUTHOR]