METHOD FOR DEPERSONALISATION OF PERSONAL DATA Russian patent published in 2015 - IPC G06F21/00 

FIELD: physics, computer engineering.

SUBSTANCE: invention relates to protecting information stored in personal data information systems from unauthorised access and can be used at steps of developing and optimising secure personal data information systems. The technical result is a higher level of security of personal data information systems. The method for depersonalisation of personal data protects personal data information systems from unauthorised access at development and optimisation steps, handles personal data of subjects stored and processed in the personal data information systems and performs two-step movement of data relating to different subjects using first and second layer rearrangement, wherein at the first step a source data set D(d₁, d₂, …, d_N), where N is the number of attributes, is broken down into non-overlapping data subsets A_i relating to one attribute d_i, and at the second step the data are directly rearranged first within the subsets A_i and the rearrangement elements are then the subsets themselves. As the number of personal data subjects increases, the probability of selecting depersonalisation parameters decreases, thereby improving security of personal data information systems.

EFFECT: breaking down a source data set into subsets enables to reduce the dimension of the problem and simplify practical implementation thereof.

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