Turanov D.Selbayev A.2023-11-212023-11-212019D. Turanov , A. Selbayev / THREAT FOR QKD WITH A TRANSFER OF A MODIFIED CONDITION / СДУ хабаршысы - 20192415-8135https://repository.sdu.edu.kz/handle/123456789/837Abstract. Quantum key distribution makes it possible to generate a secret key between authenticated users. The security of the process, it is possible to achieve, by using the states of quantum mechanics. To date, the quantum system is in experimental states, although several commercial projects have already been implemented. And in particular, single-photon avalanche photo-detectors. The technical level of devices does not yet allow creating the ideal condition for an ultra-secure system. In this article we will present the attack method and the protocols that are able to detect these attempts.enBB84BB92photo-detectorssingle-photoncryptosystemultra-secure systemphoto-diodeСДУ хабаршысы - 2019№3Article