| 摘要 |
Each object (such as for example an integrated circuit) of a population of similar objects is configured to generate instances of a dynamic binary identification code (ID) that differ from instances of IDs generated by all other member objects of the population. While bits residing in most of the bit positions of the ID generated by each member object of the population do not vary in state from instance-to-instance of that ID, bits residing in one or more of the bit positions of the ID may vary (drift) in state from instance-to-instance of that ID. A set of instances of the ID generated by each member object of the population are analyzed to construct a separate "drift profile" for each member object's ID indicating for each bit position a probability that the bit position will contain a bit of a particular state. Thereafter, to verify that a particular object is a specific member object of the population, a set of instances of the ID generated by that particular object is analyzed to construct a drift profile for that particular object's ID. That drift profile is then compared to the drift profiles of the IDs generated by the member objects of the population to determine whether the particular object is a certain specific member object of the population.
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