FIELD: servicing multistage counters.
SUBSTANCE: in order to use multistage counter for counting in single direction readings of single-stage count of auxiliary counter variable only in single direction are changed at given states of multistage counter readings, states of multistage and single-stage auxiliary counter readings are recorded, first authenticity data are generated due to binding auxiliary counter readings with additional data.
EFFECT: enhanced reliability of protection against manipulating counter readings.
5 cl, 1 dwg
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