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US 2015/0319000 A1Published application
Derivation of a Device-Specific Value
AssigneeSiemens Aktiengesellschaft
InventorsRainer Falk, Andreas Mucha
Life of this patent
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Abstract
A method and an apparatus for deriving a device-specific value from a physical unclonable function realized on a device are provided. Categorization information items are allocated to responses derived from challenges. The categorization information items are derived from statistical variations. The device-specific value may be processed further as a key bit or as an identifier.
Claims16
A method for deriving a device-specific value from a physical unclonable function realized on a circuit unit, the method comprising:
- ascertaining a first response from application of a first challenge to the physical unclonable function on the circuit unit at least once;
- ascertaining at least one second response from application of a second challenge to the physical unclonable function at least once;
- deriving, by a processor, a respective categorization information item from a respective response, the deriving comprising allocating the respective response to one of at least two respective categories with regard to a statistical variation, the at least two respective categories being stipulated by at least one prescribable threshold value;
- and
- deriving, by the processor, the device-specific value from at least two of the respective categorization information items.
2 more elements
An apparatus comprising:
- a challenge generator configured to produce at least two challenges;
- a circuit unit comprising at least one physical unclonable function for deriving a device-specific value, the circuit unit being configured to produce a respective response when a respective challenge of the at least two challenges is applied to the physical unclonable function;
- a response categorizer configured to derive a respective categorization information item from a respective response by allocation of the respective response to a respective category, stipulated by at least one prescribable threshold value, with regard to a statistical variation;
- and
- a derivation unit configured to derive the device-specific value from at least two of the respective categorization information items.
2 more elements
Dependencies are inferred from the claim text.