The UEFI Form has a new whitepaper on UEFI and the Chain of Trust:
https://twitter.com/Intel_UEFI/status/743874217603538946
The Chain of Trust: Keeping Computing Systems More Secure
UEFI Forum white paper explaining the Chain of Trust and its role in keeping computing systems secure
http://www.uefi.org/learning_center/papers
http://www.uefi.org/sites/default/files/resources/UEFI%20Forum%20White%20Paper%20-%20Chain%20of%20Trust%20Introduction_Final.pdf
