Portable data carrier having operating error counter

摘要

In a method in a portable data carrier for securing the data carrier against external attacks on the data carrier, there is employed at least one counter in the data carrier. A specified command is secured here such that it is executed by the data carrier only when the at least one counter lies in a specified, permissible values range, in particular does not undershoot a specified minimum value. The at least one counter is actuated, normally decremented, according to the invention when it is recognized on the basis of a rollback buffer of the data carrier that a preceding execution of a command has been disturbed.