As cyber threats and attacks increase, federal agencies are continuing their efforts to implement zero trust security architecture. SentinelOne reports a 70% increase in global cyberattacks since 2023, with 2026 showing an 18% year-over-year increase, and Federal News Network found that when geopolitical risk spikes, attacks on U.S. government systems increase by 35-45% within months. Dynamic, scalable security methods are needed to combat these threats.
The Zero Trust Mindset
Zero trust is a cybersecurity strategy operating on the principle “never trust, always verify,” assuming threats exist both inside and outside the network. Through a series of executive orders, policies and federal agency strategies, federal agencies are required to implement Zero Trust Architecture which eliminates implicit trust, requiring strict identity verification for every person and device attempting to access resources, regardless of their location.
Key Principles of Zero Trust Security
- Verify Explicitly: Always authenticate and authorize based on all available data points, including user identity, location, device health, and service/workload.
- Use Least-Privilege Access: Limit user access with just-in-time and just-enough access, risk-based adaptive policies, and data protection.
- Assume Attacker Presence: Limit potential impact through segmentation, continuous monitoring, and rapid thread detection and response.
Attribute Based Access Control
Traditionally, most organizations have implemented Zero Trust using Role-Based Access Control (RBAC) which is a security method that restricts network, system, or application access based on defined roles within an organization. RBAC enhances security by broadly enforcing the principle of least privilege for their role, ensuring employees only have access necessary for their job functions.
However, RBAC is still a high-level control. As organizations continue to mature their Zero Trust architecture, shifting to Attribute-Based Access Control (ABAC) provides finer-grained, more dynamic decision-making. ABAC depends on attributes like user, device health, data sensitivity, location, time, or risk score. It provides granular, policy-based security (e.g., “Allow employees to edit files if they are in the office during business hours”) rather than static role assignments, making it highly flexible and scalable for modern security needs.
Key Benefits of ABAC
- Granular Control: Access is determined by combining multiple attributes (e.g., department, security clearance, location), allowing for specific, tailored policies.
- Dynamic Security: Policies adapt to real-time conditions, such as revoking access if a device’s security posture becomes compromised.
- Reduced Administrative Burden: Instead of managing individual roles for thousands of users, administrators define broad policies based on attributes, automatically covering new users or changes in user status.
- Enhanced Compliance: Enables strict, auditable control over sensitive data, frequently used in military and governmental organizations.
ABAC Enhances Zero Trust
ABAC acts as the enforcer within a Zero Trust architecture, using attributes (user, device, context) rather than static roles to dynamically determine access and uphold “never trust, always verify” principles.
To implement a true Zero Trust strategy, you need fine-grained controls, which ABAC provides. For example, if a user’s device becomes unpatched (reducing its security rating), ABAC can immediately revoke access to sensitive systems, satisfying the Zero Trust requirement for continuous authorization.
Identity Drift
Identity drift in the context of ABAC is when the attributes used to make access decisions become inaccurate, outdated, or inconsistent with reality causing access policies to make the wrong decisions. Identity drift is the silent failure mode of ABAC as ABAC is only as strong as the accuracy and freshness of its attributes.
For example, when attributes such as department, role, device posture change but they are not reflected in the systems of record, access may be granted inappropriately as the attributes no longer reflect the truth. This means:
- Users may keep access they shouldn’t have.
- Users may lose access they should have.
- Policies execute correctly but are based on bad data.
Avoiding Identity Drift
Zero trust depends on continuous verification and real time context. To avoid identity drift, it’s important for access governance to reflect and mitigate the types of identity drift.
Types of Identity Drift
- Attribute: Values are stale or incorrect resulting in outdated or incorrect information.
- Temporal: Delays in updating attributes do not reflect real-time changes in user status or conditions.
- Source: Multiple systems provide conflicting attribute values.
- Context: Real-world context changes (device, location, risk) are not reflected in the attributes.
As organizations embrace ABAC, reviewing and refreshing authoritative sources of attribute information are critical. Real-time or near real-time data synchronization, attribute governance (owners, update frequency and validation), and automated lifecycle management catch drift before it occurs.
Maturing a Zero Trust strategy demands a shift toward dynamic, data-driven access control grounded in trusted identity and context. ABAC enables this evolution by providing the fine-grained, adaptive enforcement needed to keep pace with modern threats and mission demands. However, its effectiveness depends on the integrity, timeliness, and governance of the underlying attributes.
By investing in authoritative data sources, real-time synchronization, and continuous monitoring, agencies can minimize identity drift and ensure access decisions remain accurate and defensible. In doing so, they not only strengthen their security posture but also enhance operational agility and resilience in an increasingly complex threat landscape.