Bare silicon refers to the raw, unpackaged semiconductor material used as the foundation for manufacturing integrated circuits and computer chips. It consists of thin slices or wafers of pure silicon that have not yet been encapsulated or protected by any casing or packaging. In cybersecurity, bare silicon is significant because it represents the most fundamental level of hardware, where security vulnerabilities can be introduced during the chip fabrication process. Physical access to bare silicon can allow attackers to reverse-engineer, tamper with, or implant malicious modifications before the chip is packaged and distributed. Ensuring the integrity of bare silicon is crucial for hardware security and trust in computing devices.