As new standards and regulations emerge, we need to be sure that Uptane references these text, and complies with what they stipulate. Therefore, we need to add text that references SAE J3101 (H/W Protected Security Environments, aka HSMs), ISO/SAE 21434 Road Vehicle Cybersecurity, ISO 24089 Vehicle S/W Update, and others. As @iramcdonald points out, these will be the core specs for security audits for UNECE WP29 regulations by 2022.