A method is worked out for ensuring fault tolerance at the symptoms of non-
byzantine and byzantine faults in redundant computer control systems of a d
efinite class. The consistency of results of the local processing of fault
symptoms for all channels is provided by the original structure of checkpoi
nts and also by the algorithm for ensuring fault tolerance with the use of
a system log and hardware support-a localization unit. The method under dis
cussion insignificantly reduces the capacity of a system, makes it possible
to counteract byzantine faults at a number of channels in the system equal
to three, and totally precludes their masking (disguise).