CPC G06F 21/44 (2013.01) [G06F 2221/2103 (2013.01)] | 16 Claims |
1. A device for generating a unique response to a challenge, the device comprising:
a plurality of structures, each structure configured to change from a first distinct state to a second distinct state in response to an appropriate input challenge;
the device being arranged to facilitate a challenge of the plurality of structures in combination, by changing an input to the plurality of structure in combination, to cause each structure of the plurality of structures to change from the first distinct state to the second distinct state, wherein the device includes:
a first part including less than all of the structures, and
a second part including a remaining number of the structures,
wherein the first part and the second part are connectable and separable to selectively assemble or disassemble the device, allowing structures from the first and second parts of the device to be challenged in combination, or to prevent such a combined challenge, and wherein, as part of the challenge, the device is arranged to facilitate a measurement of an output of the plurality of structures in combination, in response to the input;
wherein the unique response is at least indicative of a sequence in which the change in state takes place for each of the plurality of structures, in response to the input.
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