A secure, device-unique method for key generation without storing keys at rest.
Cryptographic keys are the cornerstone of secure digital systems, enabling encryption, authentication, and data integrity. However, securely storing these keys on-chip presents significant challenges. Traditional methods, such as storing keys in one-time programmable, non-volatile memory, are vulnerable to physical attacks, environmental variations, and lifecycle management issues. Physical Unclonable Functions (PUFs) have emerged as a groundbreaking solution to these challenges, offering a secure, device-unique method for key generation and storage. Among the various PUF technologies, SRAM PUF stands out for its reliability, scalability, and cost-effectiveness. It is currently deployed as a hardware Root Key in more than one billion devices, ranging from low-cost MCUs to high-end FPGAs, and across many different industries.
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Fig.1: Enrollment and reconstruction phases of SRAM PUF. Source: Synopsys
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