Patent ID: 11954201
Assignee: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. A system comprising:
a processor and memory, wherein the memory stores instructions that, in response to execution by the processor, cause the processor to perform operations comprising:
identifying a specific net within an integrated circuit design that is likely to be used in a malicious attack;
adding additional nets to the integrated circuit design that add additional logic states to a finite state machine present in the integrated circuit design, wherein the additional logic states comprise watermarking states for performing authentication of the integrated circuit design, wherein a state transition to the watermarking states is dependent upon on an output of the specific net, wherein an output of the additional nets is governed by one or more secret key inputs applied to the additional nets, wherein the additional nets comprise a multiple shift input register (MISR) followed by an XOR network;
applying the secret key inputs to the additional nets;
capturing, at an output of a leakage enabling circuit, a side channel signature upon application of the secret key inputs to the additional nets; and
deciphering a watermark digest from the side channel signature based on a switching activity of the output of the leakage enabling circuit, wherein the MISR applies values of individual nets over multiple timesteps to create an n-bit digest and the XOR network compresses the n-bit digest to a final k-bit watermark digest, where k<n,

wherein when the integrated circuit design is being authenticated, a manufactured integrated circuit design is traversed to the watermarking states with an application of specific key inputs, wherein the additional nets becomes functional in generating a correct watermark digest response only at the watermarking states, wherein if responses match golden references stored during an enrollment process of the integrated circuit design, the manufactured integrated circuit design is recognized as an authentic device, wherein the responses correspond to the watermark digest and the specific key inputs correspond to the secret key inputs.