What significant publication established criteria for defining a 'trusted' computer system in 1983?

The Trusted Computer System Evaluation Criteria (TCSEC) is the significant publication that established criteria for defining a 'trusted' computer system in 1983. This document, commonly referred to as the Orange Book, laid out a set of standards and guidelines for evaluating the integrity, confidentiality, and overall security of computer systems. TCSEC focuses on defining what is required for a computer system to be considered trustworthy, classifying systems into different levels of trust based on their security features and operational capabilities.

TCSEC provided a foundational framework for security evaluations that influenced the development and assessment of government and commercial computer systems. Its categories, such as minimal protection, discretionary protection, and mandatory protection, helped organizations understand and implement varying levels of security measures. By establishing these criteria, TCSEC played a crucial role in enhancing trust in computer systems and guiding security practices in the field of computing.