RETROFITTING ENCRYPTED FIRMWARE IS A BAD IDEA™

Summary from the TLDR InfoSec newsletter

This blog post discusses a firmware encryption method on Lexmark printers called WTM, which interacts with kernel modules and uses netlink commands. The WTM firmware, likely developed by Marvell, handles secure boot, authentication, and key management. Its process involves analyzing kernel modules, reverse engineering the firmware, and understanding command structures for encryption operations.