In 2011, Joanna Rutkowska unveiled an easy-to-use tool for mitigating many attacks on system boot chains by using the TPM - the Anti Evil Maid. Unfortunately the implementation was difficult to incorporate into normal system boot in a secure manner - anybody able to observe a user could recreate the secret. This presentation describes a method to allow systems to prove their identity to the user without making it trivial for attackers to mimic a secure boot and extract secrets from the user, and why the state of modern hardware means this may still not be enough.

Matthew Garrett