How is a unique identifier added to an identity system?

A unique identifier is essential in identity and access management as it allows for the clear distinction and differentiation of users within a system. Issuing a keycard or a unique username directly fulfills this purpose by providing each individual with a distinct reference that can be used to authenticate and authorize access to resources.

A keycard serves as a tangible object attributed to a specific user, which can be scanned or swiped at access points, ensuring that only authorized individuals can enter secure areas. Alternatively, a unique username serves as an entry credential within digital systems, linking the user to their associated profile and permissions. This clear attribution of identity is critical for maintaining security and accountability within an organization.

While other options like creating a password or using encryption are important security practices, they do not serve the primary function of establishing a unique identifier. Additionally, secondary verification methods, such as two-factor authentication, enhance security but do not inherently create a unique identity for the user within the system. Thus, the most effective method of adding a unique identifier is through the issuance of keycards or unique usernames.