Identity Mapping

What is Identity Mapping?

Identity mapping is a fundamental concept in identity and access management (IAM) that defines how user identities and their associated attributes are represented and synchronized across different systems, applications, and directories. It establishes a consistent and authoritative source for identity data, ensuring that a single user is recognized and managed uniformly regardless of the platform they interact with.

In practice, identity mapping involves translating or correlating identity information from one system’s format or schema to another. This process is crucial for achieving interoperability and enabling seamless user experiences, such as single sign-on (SSO), where a user’s credentials are used to access multiple resources without re-authentication.

Effective identity mapping simplifies user lifecycle management, enhances security by providing a unified view of user access rights, and reduces the operational overhead associated with managing duplicate or inconsistent identity data across disparate IT environments.

Key Takeaways

• Identity mapping ensures user identities are consistent across multiple systems.
• It is crucial for enabling features like single sign-on (SSO) and centralized access control.
• The process involves translating identity data and attributes from one format to another.
• Effective mapping simplifies user lifecycle management and enhances security posture.

Understanding Identity Mapping

At its core, identity mapping addresses the challenge of diversity in how identities are stored and managed within an organization’s IT infrastructure. Different systems, such as HR databases, Active Directory, cloud applications (like Microsoft 365 or Google Workspace), and legacy applications, often use varying schemas, protocols, and data formats for user identities. Identity mapping acts as a bridge, enabling these systems to understand and recognize the same user, even if their representations differ.

This mapping can be rule-based, where specific attributes are used to link identities, or it can involve unique identifiers assigned to users that are maintained consistently across all integrated systems. The goal is to create a ‘source of truth’ for identity data, which then informs all other connected systems. This authoritative source dictates how user accounts are provisioned, de-provisioned, and how their permissions are managed.

Consider a scenario where an employee joins a company. Their initial identity is created in the HR system. Identity mapping ensures that this single HR record is used to automatically provision accounts in Active Directory, email systems, and other business applications. When the employee’s role changes, an update in the HR system, facilitated by identity mapping, propagates the changes to all relevant systems, adjusting access rights accordingly.

Formula

Identity mapping is not typically represented by a single mathematical formula. Instead, it relies on a set of logical rules, algorithms, or attribute-based correlation techniques to establish the links between identities. These rules can be based on attributes such as:

• Unique Employee ID: A universally assigned identifier.
• Email Address: A common attribute used for linking accounts.
• Username: A consistent login identifier across systems.
• Combination of Attributes: Such as First Name + Last Name + Department.

The ‘formula’ is essentially the logic defined within the identity management solution that specifies how to match an identity in one system (Source) to an identity in another system (Target). For example:

Target_Identity_Attribute_X = Map(Source_Identity_Attribute_Y, Z)

Where Map represents the mapping logic, Source_Identity_Attribute_Y is an attribute from the source system, and Z represents any transformation or rule applied during the mapping process.

Real-World Example

A common real-world example of identity mapping is the synchronization between an organization’s Human Resources Information System (HRIS) and Microsoft Active Directory (AD). When a new employee is hired, their details (name, employee ID, department, etc.) are entered into the HRIS, which is considered the authoritative source of employee data.

An identity management tool then reads this data from the HRIS. Using predefined mapping rules, it correlates the HRIS identity with the appropriate attributes required for an AD account. For instance, the HRIS employee ID might be mapped to the employeeID attribute in AD, the employee’s name to the displayName, and their email to the userPrincipalName.

This mapping ensures that a single, accurate user object is created in Active Directory, enabling the user to log into their Windows computer and access network resources. If the employee’s department changes, updating this in the HRIS will trigger a re-sync, and identity mapping will ensure the corresponding attribute in AD is updated, potentially affecting group memberships or access permissions.

Importance in Business or Economics

Identity mapping is critical for modern businesses as it directly impacts security, operational efficiency, and user productivity. By ensuring a single, consistent view of user identities, organizations can enforce access controls more effectively, reducing the risk of unauthorized access and data breaches.

Economically, it streamlines IT operations by automating user provisioning and de-provisioning, which significantly lowers administrative costs. It also enhances employee productivity by enabling seamless access to the applications and data they need to perform their jobs, often through single sign-on, without redundant login procedures.

Furthermore, robust identity mapping supports compliance requirements by providing an auditable trail of user access and management activities. This consistency is vital for businesses operating in regulated industries where strict data governance and access management are mandated.

Types or Variations

While the core concept remains the same, identity mapping can manifest in different forms depending on the context and technology used:

• Attribute-Based Mapping: Relies on matching one or more attributes (e.g., email address, employee ID) between source and target systems to link identities. This is common for synchronization between HRIS and directories.
• Identifier-Based Mapping: Uses a common, unique identifier that is explicitly designed to be the same across all systems, often referred to as a ‘federated ID’ or ‘global ID’.
• Protocol-Specific Mapping: Certain protocols like SAML (Security Assertion Markup Language) or OAuth define specific ways to map user attributes from an identity provider to a service provider during authentication and authorization flows.
• Role-Based Mapping: Involves mapping an individual’s role in a source system to predefined roles or permission sets in a target system, automating the assignment of appropriate privileges.

Related Terms

• Identity and Access Management (IAM)
• Single Sign-On (SSO)
• Directory Services (e.g., Active Directory, LDAP)
• Identity Federation
• User Provisioning/De-provisioning
• Attribute Synchronization

Sources and Further Reading

• Okta: What is Identity Mapping?
• IBM Documentation: Identity Mapping Concepts
• Microsoft Docs: UserPrincipalName considerations for hybrid identity

Quick Reference

Identity Mapping: Correlating user identities and attributes across different IT systems to ensure consistency and interoperability for unified access management.

Frequently Asked Questions (FAQs)