The Wiretap Channel for Capacitive PUF-Based Security Enclosures

In order to protect devices from physical manipulations, protective security enclosures were developed. However, these battery-backed solutions come with a reduced lifetime, and have be actively continuously monitored. overcome drawbacks, batteryless capacitive based on Physical Unclonable Functions (PUFs) been developed that generate key-encryption-key (KEK) for decryption of the key chain. reproduce PUF-key reliably compensate effect noise environmental influences, generation includes error correction codes. drilling attacks aim at partially destroying enclosure also alter PUF-response are subjected same procedures. Correcting attack effects, however, is highly undesirable as it would destroy concept enclosure. general, designing codes such they provide tamper-sensitivity attacks, while still correcting effects challenging task. We tackle this problem by first analyzing behavior under external influences different post-processing parameters. From this, we derive system model PUF-based enclosure, construct wiretap channel implementation q-ary polar verify obtained scheme in Monte Carlo simulation demonstrate our achieves layer 100 bits 306 entropy PUF-secret. Through further develop bring them one step closer their commercial deployment.