METHOD FOR FORMING KEY OF ENCRYPTION/DECRYPTION Russian patent published in 2018 - IPC H04L9/08 

FIELD: physics.

SUBSTANCE: method is carried out through the formation of a confidential key of the key distribution center, which is carried out on the basis of the sensor by selecting random numbers of coefficients of the symmetric polynomials {ƒ_i{x₁, x₂)}, over the field GF(2⁶⁴), the personal confidential key of the user is produced in the form of ratios of polynomials {g_A,i (x)}, obtained by substituting the YA identifier in the polynomials {ƒ_i(x₁, x₂)}, instead of one of the arguments: g_A,i(x)=ƒ_i(x, Y_A)=ƒ_i(Y_A, x)mod(2⁶⁴), the session key K_AB is obtained usinga lookup in a personal confidential key {g_A,i(x)}, of the correspondent identifier: K_AB,i=g(Y_B)mod(2⁶⁴), while the session key with a length of n bits is a concatenation of the values of polynomials over the field GF (2⁶⁴) K_AB=K_AB,0||K_AB,1||…||K_AB,r-1 i.e. it can be calculated using the formula K_AB=K_AB.0+K_AB,1⋅(2⁶⁴)+K_AB.2⋅(2⁶⁴)²+K_{AB, r-1}⋅(2⁶⁴)^r-1.

EFFECT: reducing the time required to complete the procedures for obtaining personal and session keys.

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