Intel® Trusted Execution Technology: Software Development Guide
Intel’s technology for safer computing, Intel® Trusted Execution Technology (Intel® TXT), defines platform-level enhancements that provide the building blocks for creating trusted platforms.
Whenever the word trust is used, there must be a definition of who is doing the trusting and what is being trusted.... This enhanced platform helps to provide the authenticity of the controlling environment such that those wishing to rely on the platform can make an appropriate trust decision. The enhanced platform determines the identity of the controlling environment by accurately measuring the controlling software (see Section 1.1).
Another aspect of the trust decision is the ability of the platform to resist attempts to change the controlling environment. The enhanced platform will resist attempts by software processes to change the controlling environment or bypass the bounds set by the controlling environment.
What is the controlling environment for this enhanced platform? The platform is a set of extensions designed to provide a measured and controlled launch of system software that will then establish a protected environment for itself and any additional software that it may execute.
Read the full Intel® Trusted Execution Technology Software Development Guide.