A Trusted Bootstrap Scheme on EFI

Extensible Firmware Interface (EFI) is a new interface applied for platform firmware and the operating system. Due to providing extensibility and customization, EFI is also a new technology instead of the conventional Basic Input-Output System (BIOS). However, the issue of building trusted EFI BIOS becomes increasingly important. The key of establishing trusted EFI BIOS is based on the trust transition. Therefore, we formalize the principles of building the trust chain firstly, and then present a suggested trust transition model in this paper.