Tails OS the operating system recommended by Edward Snowden, now works on systems with UEFI Secure Boot enabled. Tails OS is built from the ground up to offer maximum security and privacy running of a portable drive and leaving no trace on the host computer. The latest Tails OS 4.5 update added support for this crucial UEFI Secure Boot feature which was already found in most operating systems. Secure Boot uses cryptographic signatures to verify the integrity of firmware files loaded on system boot and insure they have not been tempered with.

Secure Boot has been available as part of the UEFI specification now for over two decades but is rarely used due to compatibility reasons. While not commonly used, the fact that a security focused operating system did not support this security feature was worrying for many as it meant Secure Boot had to be disabled on the host computer before the OS could boot. Work to add the feature has been ongoing over the last 6 years and is now complete and ready for use.