FIELD: data carriers.
SUBSTANCE: data carrier has memory with program, capable of performing operation h. These data and the very operation h are subjected to distortion to prevent unsanctioned access to data x, processed with said operation h. Distortions of data x and said operation h are mutually synchronized to receive, in case of performing distorted operation hR1R2, either non-distorted output data y, received as a result of performing non-distorted operation h with them, or distorted output data 
from which it is possible to produce output data y.
EFFECT: higher efficiency.
2 cl, 6 dwg
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