Enterprise security is increasingly centered on identity as organizations operate across cloud platforms, SaaS applications, remote endpoints, APIs, and third-party systems. Identity and Access Management (IAM) helps organizations determine who can access a resource, what permissions are appropriate, and when that access should expire. CISA recommends inventorying, auditing, and tracking digital identities, including user, service, and system accounts, as part of effective IAM.
DataIntelo estimates the global IAM market at $21.4 billion in 2025, with projections of $62.8 billion by 2034, representing a 12.7% CAGR from 2026 to 2034. Advanced authentication accounted for 22.4% of revenue in 2025.
Why Identity Is Becoming the New Security Perimeter
Traditional security models focused heavily on protecting the corporate network perimeter. Cloud services, remote work, mobile devices, and third-party applications have made that boundary increasingly difficult to define.
NIST’s Zero Trust Architecture shifts the focus toward users, devices, assets, and resources rather than network location. It requires authentication and authorization before access to enterprise resources is established, removing implicit trust based on where a user or device connects.
For example, an organization with 10,000 employees and access to an average of 10 applications per employee could have approximately 100,000 user-application relationships to govern. This illustrates why centralized identity policies and consistent access controls become important as environments expand.
Reducing Unnecessary Access
Excessive permissions can remain active when employees change departments, complete projects, or leave an organization. CISA recommends least privilege, regular account reviews, and removing unnecessary access to reduce these risks.
Consider an organization with 10,000 employees. If 10% require privileged access, approximately 1,000 accounts would need enhanced administrative controls. Time-limited elevation can further reduce the number of permanently privileged accounts.
| IAM capability | Security contribution | Practical metric |
| Single sign-on | Centralizes authentication | Application coverage |
| MFA | Adds verification | MFA enrollment rate |
| RBAC | Limits permissions | Role mapping coverage |
| Access reviews | Removes outdated access | Permissions remediated |
| Privileged access | Controls administrators | Temporary elevation rate |
MFA Requires More Than Simply Turning It On
MFA provides an additional verification layer beyond passwords. A strong IAM program should prioritize MFA for privileged accounts, remote access, email, and other sensitive systems. Phishing-resistant authentication methods can provide stronger protection than methods that depend on codes or approval prompts.
For an organization with 5,000 users, achieving 100% MFA coverage would ensure that every active account has an additional authentication layer. Organizations can monitor enrolment, exception rates, failed authentication attempts, and privileged-account coverage to measure effectiveness.
MFA deployment should also consider usability and recovery procedures. Poorly managed enrolment or excessive exceptions can create security gaps, while phishing-resistant methods such as FIDO-based authentication can strengthen protection against credential theft.
Automation Improves Joiner, Mover, and Leaver Processes
Manual provisioning can create inconsistent access when employees join, change roles, or leave. CISA recommends maintaining identity inventories and monitoring account status and permissions throughout the identity lifecycle.
For example, if an organization processes 500 employee changes per month and each change affects 8 applications, administrators could handle approximately 4,000 access actions monthly. Automated provisioning can standardize these changes and create a clearer audit trail.
Organizations can establish practical targets, such as disabling standard access within 60 minutes of confirmed termination and reviewing unresolved exceptions every 30 days. These are organizational targets rather than universal government requirements.
Access Reviews Should Produce Measurable Results
Access reviews are most valuable when they lead to actual permission changes. CISA recommends periodically reviewing identities and access rights and removing access that is no longer required.
An organization with 20,000 identities and 200,000 application permissions could conduct quarterly reviews and track approvals, modifications, and removals. If 5% of permissions were identified as unnecessary, that would represent 10,000 permissions requiring remediation.
Key measurements include:
- MFA coverage: Percentage of active identities protected by MFA.
- Dormant accounts: Number of inactive identities retaining access.
- Deprovisioning time: Average time required to disable terminated accounts.
- Privileged identities: Number of accounts with administrative permissions.
- Permission remediation: Percentage of unnecessary permissions removed.
- Exception age: Number of days temporary access remains active.
These indicators help security teams connect IAM activity with measurable outcomes.
Zero Trust Makes Access Decisions More Contextual
NIST’s Zero Trust model removes implicit trust and requires authentication and authorization before access is established. The model focuses on protecting resources rather than relying on network location as the primary security boundary.
Organizations can translate these principles into measurable internal policies. For example, a security team might require step-up authentication after 5 failed login attempts, review an account after 3 high-risk events, or limit privileged sessions to 30 minutes. These are illustrative organizational thresholds, not NIST-mandated values.
NIST also extends Zero Trust principles to cloud-native environments, where application and service identities can be used to enforce granular access policies across hybrid and multicloud systems.
Common IAM Mistakes Can Weaken Security
IAM programs can underperform when organizations retain dormant accounts, grant broad administrative privileges, rely exclusively on passwords, or allow temporary permissions to become permanent.
A practical IAM program should therefore maintain an accurate identity inventory, establish role-based permissions, enforce MFA, separate privileged accounts, automate lifecycle changes, and review high-risk access regularly. CISA’s IAM guidance specifically emphasizes inventorying and auditing identities and permissions as ongoing activities rather than one-time exercises.
The Future of IAM Extends Beyond Employees
IAM increasingly covers service accounts, applications, APIs, and other machine identities. CISA explicitly includes service and system accounts within IAM, while NIST’s cloud-native Zero Trust guidance emphasizes identity-based authentication and authorization for applications and services.
For an illustrative environment containing 2,000 human identities and 500 service accounts, IAM governance would need to cover 2,500 identity records. Each should have defined ownership, appropriate permissions, monitoring, and lifecycle controls.
IAM is therefore moving beyond basic authentication toward continuous identity governance. Strong MFA, least privilege, automated lifecycle management, recurring access reviews, and contextual authorization can make identity a measurable and durable layer of enterprise security.
Sources/Reference:
- DataIntelo, Identity and Access Management (IAM) Market Research Report 2034. DataIntelo IAM Market Report
- CISA, Identity and Access Management: Recommended Best Practices for Administrators. CISA IAM Best Practices
- NIST, SP 800-207: Zero Trust Architecture. NIST Zero Trust Architecture
- NIST, SP 800-207A: A Zero Trust Architecture Model for Access Control in Cloud-Native Applications in Multi-Cloud Environments. NIST SP 800-207A
