What is the name of the international standard that establishes a baseline level of confidence in the security functionality of IT products by providing a set of requirements for evaluation?

The 'Blue Book' is informal terminology sometimes applied to various government documents; it does not refer to a recognized international IT security evaluation standard.

ISO 26029 is not the standard for IT security product evaluation - the correct ISO standard for this purpose is ISO/IEC 15408, which is Common Criteria.

Common Criteria, formally known as ISO/IEC 15408, is the international standard that provides a structured set of security functional requirements and assurance requirements used by independent testing laboratories to evaluate IT products. It establishes Evaluation Assurance Levels (EAL1 through EAL7) that define the depth and rigor of the evaluation, giving buyers and governments a standardized basis for trusting IT product security claims.

The Wassenaar Arrangement is a multilateral export control regime that governs trade in dual-use goods and munitions including certain security technologies, not a framework for evaluating IT product security functionality.