Access control is a fundamental component of any physical security strategy. It determines who can enter which spaces, when they can enter, and what they can do once inside. Understanding the three main types of access control helps you choose the right approach for your organization.
What Is Access Control?
Access control is any system that manages entry to physical spaces. This can range from traditional lock-and-key systems to modern cloud-managed platforms with mobile credentials, biometrics, and real-time monitoring.
The 3 Types of Access Control
1. Discretionary Access Control (DAC)
In a discretionary access control system, the owner or administrator of a resource decides who gets access. This is the most flexible — and least secure — model.
How it works:
- A resource owner (e.g., office manager) grants or revokes access to individual users.
- Users may be able to transfer their access to others.
- Access decisions are made on a case-by-case basis.
Pros:
- Simple to implement and understand
- Flexible for small organizations
- Low administrative overhead
Cons:
- Difficult to manage at scale
- Higher security risk (users can share access)
- No centralized policy enforcement
- Poor audit trail
Best for: Small offices, shared workspaces, or low-security areas where convenience matters more than strict control.
2. Role-Based Access Control (RBAC)
Role-based access control assigns permissions based on a user's role within the organization. Instead of managing access for each individual, you define roles (e.g., "Engineer," "Manager," "Visitor") and assign access permissions to those roles.
How it works:
- Define organizational roles with specific access permissions.
- Assign users to roles.
- Users automatically inherit the access permissions of their role.
- Changing a role's permissions updates access for everyone in that role.
Pros:
- Easy to manage at scale
- Consistent policy enforcement
- Simple onboarding/offboarding (assign/remove role)
- Clear audit trail
Cons:
- Can become complex with many roles
- May not handle exceptions well
- "Role explosion" if too granular
Best for: Mid-size to large organizations with defined organizational structures and standardized access needs.
3. Attribute-Based Access Control (ABAC)
Attribute-based access control makes access decisions based on multiple attributes — user attributes (department, clearance level), resource attributes (sensitivity, location), and environmental attributes (time of day, threat level).
How it works:
- Define policies based on combinations of attributes.
- The system evaluates attributes in real time to make access decisions.
- Access can change dynamically based on conditions.
Pros:
- Extremely granular and flexible
- Context-aware (time, location, threat level)
- Handles complex scenarios well
- Dynamic and adaptive
Cons:
- Complex to implement and manage
- Requires sophisticated software
- Higher cost
- Steeper learning curve
Best for: Large enterprises, government facilities, healthcare organizations, and environments with complex or dynamic access requirements.
Choosing the Right Type
| Factor | DAC | RBAC | ABAC |
|---|---|---|---|
| Organization Size | Small | Medium-Large | Large-Enterprise |
| Complexity | Low | Medium | High |
| Security Level | Basic | Strong | Maximum |
| Cost | Low | Medium | High |
| Scalability | Limited | Good | Excellent |
Modern Cloud-Managed Access Control
Platforms like Verkada combine the best of RBAC and ABAC in a cloud-managed solution:
- Role-based permissions with attribute-based exceptions
- Mobile credentials (phone-based access)
- Real-time monitoring and alerts
- Integration with video surveillance
- Centralized management across all sites
Conclusion
The right access control type depends on your organization's size, complexity, and security requirements. Most businesses start with role-based access control and add attribute-based policies as their needs evolve. Contact Monarch Connected to design an access control system tailored to your organization.