Zymkey 4i Hardware Security Module for Raspberry Pi - 

Zymkey plugs directly onto the GPIO header of a Raspberry Pi making it quick and easy to install, even late in the design cycle. Software APIs are available in Python, C and C++. Example code and online documentation provide a simple low-risk way to integrate Zymkey security into your application running on standard Raspbian distributions. Support for other Linux distributions is optionally available. Zymkey delivers multiple layers of security to protect against cyber and physical threats. A secure element (SE) with micro-grid protected silicon stores the most sensitive resources. A security supervisor isolates the SE from the host computer and provides additional functions of multi-factor identity/authentication for devices, and multisensor physical security.