Hardware Security

Hardware security encompasses the protection of integrated circuits and electronic systems against unauthorised access, tampering, reverse engineering and intellectual‐property (IP) theft. As semiconductor designs are increasingly outsourced across a global supply chain, sensitive design information and functional capabilities may be exposed to untrusted parties. Threats range from invasive microprobing, chemical or optical attacks and hardware Trojan insertion to non‐invasive side‐channel analysis of power, electromagnetic emissions or timing. Defences have likewise evolved from simple layout obfuscation and split manufacturing to advanced logic locking, structural camouflaging, secure scan chains and embedded watermarking. Effective schemes strike a careful balance between security and practical metrics such as area, power and performance overheads. Recent work has explored resilient obfuscation at the gate level, dynamic reconfiguration methods, forensic benchmarking of Trojan detection approaches and robust IP‐authentication strategies. The field is of broad significance for critical applications including automotive, aerospace, medical devices and the Internet of Things, where compromised hardware can lead to safety failures, data breaches and economic losses.

Research from Nature Portfolio

Novel transistor‐level logic encryption methods have been proposed to protect CMOS gates against IP piracy and reverse engineering while substantially reducing design overheads. One study introduces encrypted key‐gates with optimised transistor arrangements, achieving average reductions of 43% in area, 37% in power and 27% in delay over prior logic‐encryption topologies. A second investigation presents a security‐aware design flow for generalized likelihood‐ratio‐test hardware IP cores in electrocardiogram (ECG) detectors. By embedding a colour–interval‐graph fingerprint within the register‐transfer‐level datapath, the approach thwarts piracy and fraudulent claims of ownership without incurring any cost penalty in area or energy, and with superior tamper‐tolerance metrics compared to existing watermarking schemes.

Hardware Security publication trend

The graph below shows the total number of articles in hardware security across all publications each year (not limited to Nature Index journals).

Technical terms

Logic encryption: The insertion of key‐controlled gates into a circuit so that correct operation requires application of the secret key.

Hardware Trojan: A hidden malicious alteration or additional circuitry implanted in an IC to leak data, corrupt functionality or trigger failures.

IP camouflaging: The use of look‐alike standard cells or covert structures to mask the true logic function of circuit elements from inspection.

IP watermarking: A steganographic method that embeds a covert identifier within a design to prove rightful ownership and detect unauthorised copying.

SAT attack: A Boolean‐satisfiability‐based cryptanalysis that systematically eliminates incorrect key guesses in a logic‐locked netlist until the correct key is found.

References

1. Efficient design and analysis of secure CMOS logic through logic encryption. Scientific Reports (2023).
2. Secure hardware IP of GLRT cascade using color interval graph based embedded fingerprint for ECG detector. Scientific Reports (2024).
3. Securing IP Cores for DSP Applications Using Structural Obfuscation and Chromosomal DNA Impression. IEEE Access (2022).
4. CAS-Lock: A Security-Corruptibility Trade-off Resilient Logic Locking Scheme. IACR Transactions on Cryptographic Hardware and Embedded Systems (2019).
5. Covert Gates: Protecting Integrated Circuits with Undetectable Camouflaging. IACR Transactions on Cryptographic Hardware and Embedded Systems (2019).