How access control works
When a user or service requests access, the system first authenticates the identity, then checks policy to decide whether the request is allowed. Policies can be based on roles (RBAC), on attributes such as device health or location, or on explicit rules defined by an administrator.
Access control applies to physical spaces as well as digital ones, including badges, locks, and server rooms. Every decision should also be logged. Those audit records let teams review who accessed what, investigate incidents, and demonstrate that controls operate as designed.
Why it matters for Canadian organizations
Weak access control is a common root cause of data exposure. PIPEDA requires organizations to protect personal information with safeguards appropriate to its sensitivity, and Quebec's Law 25 adds expectations around limiting who can see personal data internally.
Regulated sectors face more detailed expectations. Financial institutions subject to OSFI B-13 are expected to manage access to technology assets carefully, and auditors for ISO 27001 or SOC 2 typically ask for evidence of access reviews. Demonstrable control over who can reach sensitive systems is often a prerequisite for contracts and cyber insurance.
How to implement it
Start with the principle of least privilege: grant only the access needed for a role, and remove it when roles change. Use a central identity provider, enforce multi-factor authentication, and prefer role-based assignments over individual exceptions that become hard to track.
Review permissions on a regular schedule, especially for administrators and third parties. Automate joiner, mover, and leaver processes so accounts do not linger. Privileged accounts deserve extra protection, including separate credentials, session monitoring, and tighter approval workflows. Document exceptions so reviewers can see why they exist.
Frequently asked questions
What is the difference between authentication and access control?
Authentication confirms who you are, for example with a password and a one-time code. Access control is the broader system that then decides what you may do. Authentication is one component of access control, alongside authorization and the logging of decisions.
What are the main types of access control?
Common models include discretionary access control (owners set permissions), mandatory access control (central policy sets labels), role-based access control (permissions follow job roles), and attribute-based access control (decisions use context such as device or location). Many organizations combine several models.
How often should access rights be reviewed?
Quarterly is common for privileged and sensitive systems, and at least annually for everything else, though your compliance framework may specify more. Reviews should also be triggered by role changes, departures, and the end of vendor contracts.
Related service: Identity and access management