What is one of the duties of a user of cryptographic controlled items?

Understanding the Electronic Key Management System (EKMS) is fundamental for a user of cryptographic controlled items because EKMS provides the framework for managing cryptographic key material securely. This system is crucial for ensuring that keys are distributed, stored, and retired properly. Users must be well-versed in EKMS protocols to maintain the integrity and confidentiality of the keys they handle, which directly impacts the security of communications and information protected by cryptographic measures.

While other duties such as ensuring communication security, creating cryptographic materials, or limiting access to equipment are important aspects of managing cryptographic operations, they are not specifically aligned with the essential knowledge and processes governed by EKMS. Thus, being knowledgeable about EKMS stands out as a critical duty for anyone working with cryptographic controlled items, enabling users to perform their roles effectively and securely within the broader framework of information security.