On-chip security circuit for detecting and protecting against invasive attacks
AssigneeIndustry-Academic Cooperation Foundation, Yonsei University
InventorsSungho Kang, Young Woo Lee
Life of this patent
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Abstract
The present exemplary embodiments provide a security circuit which senses a micro probe attack by changing both ends of a wire of a shield to be a high impedance state to change a connection state of the wire and analyzing a test signal reflected by the connected wire path, or senses a focused ion beam attack by changing both ends of a wire of a shield to be a high impedance state to change a connection state of the wire and analyzing a test signal which passes through a selected wire for every group, or blocks a physical approach by changing an accessible signal path to be a high impedance state when an external attack is detected by the detection circuit.
Claims19
A security circuit, comprising:
- a shield which includes M (M is a natural number which is larger than 2) wires and is disposed above a semiconductor chip;
- and
- a detection circuit which changes a connection state of the M wires to set a wire path and analyzes a test signal traveling the wire path to detect an external attack,
- wherein the detection circuit changes an end of at least one wire of the M wires to be a high impedance state;
- and
- wherein the detection circuit connects the M wires to generate a plurality of wire paths and changes an end of the plurality of wire paths to have an impedance value so that the test signal is reflected.
Dependencies are inferred from the claim text.