With the proliferation of IoT and other distributed systems, securing embedded devices against physical attacks has become increasingly important. Conventional techniques such as storing secret keys in non-volatile memory have been shown to be vulnerable to invasive attacks, highlighting the need for new methods of protecting such systems and reliably authenticating devices. This thesis explores Physical Unclonable Functions (PUFs) as a security primitive to ensure that secret keys and identifiers are not available to potential attackers. Specifically, the focus is on SRAM PUFs, which use memory start-up values to generate unique IDs for manufactured devices. SRAM is present on virtually all modern embedded systems, and its volatile nature means that keys are not stored in the device while it is powered down but can be recreated each time it is powered on.