A team of Korean researchers has created a new type of PUF (physical unclonable function) that is both impossible to mimic and destroy. A PUF is a “digital fingerprint” that serves as a unique identity for a semiconductor device such as a microprocessor. “The robustness of the NEM-PUF was also confirmed under several harsh environments, including high temperature, high-dose radiation, and microwaves,” states the research paper. This type of resistance is essentially unmatched by other PUFs, which can be damaged at certain temperatures. The group even enabled them to self-destruct if a breach were to occur.