A Portable TPM Scheme for General-Purpose Trusted Computing Based on EFI

Trusted computing is a promising technology for enhancing the security of platform by the TPM. The TPM is a tamper-resistant microcontroller designed to provide robust security capabilities for the trusted platform. It typically is affixed to the motherboard with LPC bus. However, It is so limitary that TPM can´t be directly used in currently common PC, TPM isn´t flexible and portable to be used in different platforms because of its interface with PC and its structure of certifications and keys. For these reasons, we propose a portable trusted platform module (PTPM) scheme to build a trusted platform for common PC based on a single crypto chip with the interface of USB and extensible firmware interface (EFI), by which users can get almost the same degree of security protection in general-purpose system. We also show that the structure of certifications and keys can bind to platforms with PTPM and provide portability and flexibility in different platforms to users while still allowing the user and platform to be protected and attested.