THE ANALYSIS OF THE SECURITY AND INFORMATION CAPACITY OF PROTOCOLS WITH SINGLE AND MULTIDIMENSIONAL QUANTUM SYSTEMS

The paper analyzes the stability and information capacity of protocols with single and multidimensional quantum systems based on the improvement of quantum methods of information protection and the development of new protocols for quantum direct secure communication with increased information capacity and resistance to attacks, determining the best protocols according to the criteria of stability and information capacity in groups of similar protocols quantum cryptography. It is shown that the protocols with the highest information capacity are simultaneously the best in terms of stability and information capacity, since the "preparation-measurement" protocols are technically easier to implement than protocols with mixed qudits, and their information capacity when using two bases is much higher than when using (n+1) bases, then we can draw the following conclusion: the best both in terms of stability and information capacity are the "preparation-measurement" protocols using two mutually unbiased ones. It is indicated that, according to the Tsizar-Kerner criterion, the resistance to a semi transparent incoherent attack of protocols of the "preparation-measurement" type and protocols with entangled qudits is approximately the same and approximately the same as the resistance of protocols "preparation-measurement" with two bases to the "interception - repeated" attack. sending" qudits (for a given n).