APPARATUS FOR QUANTUM DISTRIBUTION OF A CRYPTOGRAPHIC KEY Russian patent published in 2022 - IPC H04L9/08 

FIELD: information security.

SUBSTANCE: invention relates to means of distributing a cryptographic key. Apparatus containing a lead block and a receiving block, a quantum optical cryptographic key transmission channel containing an emitter, a single-photon detector and a beam splitter, an optical synchronisation channel, a duplex data transmission channel and an aiming channel. The duplex data transmission channel is therein made optical, and the lead block and the receiving block comprise four pairs of telescopic systems, wherein one telescopic system from each pair located in the lead block and the other one in the receiving block, wherein one pair of telescopic systems is provided with the function of emission transmission in the quantum optical channel for cryptographic key transmission and in the aiming channel, the receiving block comprises a mirror on a piezoelectric element located in the path of propagation of emissions from the laser of the cryptographic key transmission channel and from the laser of the aiming channel and provided with the function of reflecting said emissions to the beam splitter directing the emissions to the single-photon detector of the cryptographic key transmission channel and to the matrix emission receiver of the aiming channel, which is made in coarse and precise aiming channels, wherein the coarse aiming channel comprises two emission receivers in the form of CCD cameras, one in the lead block and in the receiving block, and two reflectors, one in the lead block and in the receiving block, and the laser of the aiming channel and the matrix emission receiver thereof located in the receiving block compose the precise aiming channel.

EFFECT: increase in the protection against unauthorised access.

1 cl, 1 dwg