An employee may use a company app but should not see every file inside it. A sales worker may need customer details but not another team's private records. This is the main difference between coarse grained vs fine grained access control. One gives broad access, while the other checks which data and actions a person can use.
The Real Difference Is Where the Access Decision Gets Made
Coarse grained access checks if a person can use an app. Fine grained access checks what the person can do inside it.
Coarse Grained Access Control
Coarse grained access works when a group needs the same basic permissions.
- App access: A company lets its sales team use the customer app. This does not mean every worker needs to see every customer record.
- Shared access: All support workers may use the help desk system. Workers who handle private cases may need extra limits.
Fine Grained Access Control
Fine grained access checks the file, data, or action a person wants to use.
- Record access: An account manager can see notes about their own customers. Other sales workers can use the same app without seeing those notes.
- Action control: An employee can view an invoice but cannot approve its payment. The system checks each action on its own.
RBAC vs ABAC vs PBAC vs ReBAC Is Really a Granularity Question
Each access model uses different facts to make a choice. rbac vs abac vs pbac compares access based on roles, user details, and rules. ReBAC checks how a person is linked to a file or other item.
RBAC: Access Through Roles
Role Based Access Control (RBAC) gives users permissions based on their roles. Administrators can manage access by assigning permissions to roles instead of setting them up for each worker individually. Depending on how roles and permissions are set up, RBAC can provide broad or detailed control over who can access specific resources.
- Where it fits: A payroll role lets workers use payroll tools, while an HR role gives access to staff records. This works when people in each role do similar work.
- Where it falls short: Two payroll workers may need access to different salary records. Making a new role for every small change can make the system hard to manage.
For example, role-based access control (RBAC) lets admins manage access by job role, but each role must match the work people do.
ABAC: Access Through Attributes
Attribute Based Access Control (ABAC) checks facts about the user, the data, and the action. It may also check the conditions around a request.
- Decisions based on details: A finance worker may view invoices for their own team. The system checks the worker's team and the invoice details before giving access.
- Rules that change: Access may depend on team membership or device settings. If these details change, access may change too, as long as the system has the right data.
A company can use attribute-based access control (ABAC) when a job role alone does not give enough detail to make the right choice.
PBAC: Access Through Policies
Policy Based Access Control (PBAC) uses rules to decide whether a user should be allowed to access a resource. These rules can consider roles, user details, relationships, and other conditions, depending on how the system is designed. PBAC can work differently across systems, so its features depend on the policy framework being used.
- Rules with conditions: A policy may require a worker to have an approved finance role and a valid payment before they can approve it. The system must check both conditions.
- Shared rules: A company can use the same policy for similar tasks across its apps. Each app must follow the policy for it to work.
For example, policy-based access control can set clear rules for payment approval instead of giving broad access to everyone.
ReBAC: Access Through Relationships
Relationship Based Access Control (ReBAC) checks how a person is linked to a file, project, or team. This link can affect what the person can see or change.
- File ownership: A user can edit a file they own but may only read a file shared with them. The system checks the user's link to each file.
- Team changes: An engineer can use a project while they belong to its team. When they leave, their access through that team link should end.
RBAC vs ReBAC Is Where Most Teams Feel the Limit First
The difference between rbac vs rebac is what the system checks. RBAC looks at a person's job role, while ReBAC looks at their link to a file, project, or other item.
When RBAC Does the Job
RBAC works well when people with the same job need similar access.
- Common tasks: Help desk workers can share one role that lets them use the ticketing system. They do not need separate roles for every shared task.
- Work duties: A finance role may let workers prepare reports and check invoices. Only selected workers may need permission to approve payments.
When ReBAC Makes More Sense
ReBAC helps when people with the same job need access to different files or projects.
- Shared files: One project manager may need a file that other managers cannot see. A relationship rule checks whether that person has access to it.
- Project teams: An engineer can use a code store while working on a project. When the engineer leaves the project, the related access can be removed.
Why the Two Models Can Work Together
RBAC can give basic access, while ReBAC checks which items a person can use. This is one reason rbac vs rebac is not always a choice between two separate models.
- Start with the role: An engineering role gives a worker access to development tools. It does not have to give access to every company project.
- Check the link: The system checks if the engineer belongs to the team that owns a code store. If the link is missing, the request is denied.
Where Coarse Grained Access Starts Breaking and How to Handle It
Broad access can cause problems as a company adds more teams, apps, and private data. Too many special rules may mean the old roles give people more access than they need.
Signs That the Rules Are Too Broad
Check what people can really access, not just the names of their roles.
- Extra access: A salesperson can open customer records from another region without needing them for work. The sales role may give too much access.
- Too many roles: Admins create new roles for each team, place, and special case. The long list becomes hard to check and update.
Fix the Problem Without Rebuilding Everything
Find the main access gaps and add tighter rules where broad roles are not enough.
- Check a permission: Pick a private record and find out which role or rule gives access to it. If the rule is too broad, decide what extra check is needed.
- Test the change: Keep the role for basic app access and add a rule for the record if needed. Test requests that should pass and requests that should fail.
How to Decide How Fine Your Access Control Needs to Be
The right level of control depends on the data, the actions people can take, and the harm that wrong access could cause.
Start With the Consequences of Wrong Access
Ask what could happen if someone saw, changed, copied, or deleted data without permission.
- Private data: Public product details need fewer limits than payroll or money records. Private data needs tighter access rules.
- Risky actions: Reading a report is not the same as changing it or approving a payment. Give these actions separate permissions when needed.
Choose the Model That Fits the Decision
Choose a model based on what the system needs to check.
- Roles for common tasks: RBAC works when access follows job duties. It is a good starting point for basic app access.
- More detailed checks: ABAC checks facts, PBAC uses policies, and ReBAC checks links between people and items. These models can work together when roles alone are not enough.
Consider the Cost of Maintaining the Rules
Fine grained access needs correct data and rules that stay up to date.
- Keep data correct: A rule may fail if a worker's team details are wrong. Someone must keep key user details and team links current.
- Test changes: Test normal requests and requests that should be denied before using a new rule. Review the rules when jobs or business needs change.
Most Enterprises Need Both Layers Working Together
Large companies often need basic access to common apps and tighter limits on private records and actions. Each layer should have a clear job.
Use Roles for the Common Permissions
Roles give people access to tools they need for their work.
- Give basic access: A finance role lets workers open finance tools and prepare reports. It does not need to give them access to every money record.
- Update roles: A worker who moves from sales to finance may no longer need sales access. Update the role to remove old permissions.
Add Detailed Checks for Sensitive Resources
Some files and actions need more checks than a job role can provide.
- Limit records: A finance worker may view invoices for one part of the company but not another. The system checks the right data or policy before allowing access.
- Separate actions: Several workers may view a payment, but only approved staff can approve it. Viewing a payment should not automatically give approval rights.
Make Sure the Rules Do Not Conflict
When models work together, each app must follow the right rules.
- Set clear checks: Decide which rules allow entry to an app and which control files or actions. Test the full process to find gaps.
- Keep decision records: Save why a request was allowed or denied. Admins can use these records to check access problems.
What Your Identity Platform Has to Get Right First
An identity platform manages users and permissions. Apps or access services must still check whether each user can open a file or take an action.
Identity and Permission Data Must Be Reliable
Wrong user details can give people access they should not have.
- Update user records: Changes in jobs, teams, or projects should lead to the right access changes. Former workers and contractors should not keep access they no longer need.
- Check permissions: Admins need to know which roles and groups give access to each app. This helps them find extra access.
Authorization Rules Must Be Applied Consistently
Apps must check access before showing private data or making a change.
- Check each request: Signing in proves who the user is, but it does not allow every action. The app must check permission before showing private data or changing a record.
- Handle errors safely: If a permission check fails, the system should not grant access by default. Admins need enough details to find and fix the problem.
Where Infisign UniFed Fits
Infisign UniFed is a customer identity and access management product. Its features can help apps manage customer sign in and apply access rules.
- Attribute based and conditional access: UniFed supports ABAC and conditional access features. These can help apps check user details or set conditions for access.
- Sign in choices: UniFed offers single sign-on, multi factor authentication, social login, and passwordless options such as magic authentication. These help secure sign in, while app rules still decide which records a user can open.
- Identity and app links: UniFed supports APIs and SDKs, directory links, and user lifecycle features. These help connect user identity data across apps and manage changes to user access.
For example, a company could use Infisign UniFed to manage customer sign in and supported access checks, while its app decides whether each customer can view a specific record.
Fix the Access Decisions You Cannot Explain Today
Start with one app where permissions are hard to understand. Trace how a user gets access to a private record or action.
Find Out Why Access Is Granted
Compare each user's access with the work they do.
- Trace the permission: Find out whether a role, group, policy, or relationship gives access. If the user has more access than needed, change the rule that grants it.
- Remove old access: Check the permissions of people who changed teams or left projects. Remove access they no longer need and confirm the change worked.
Correct the Highest Risk First
Start with access that could expose private data or allow harmful changes.
- Test the rule: Check one user who should have access and one who should not. This helps find rules that allow too much or block valid work.
- Check the result: Make sure the app follows the new rule and records the decision. Test again after major changes to roles, policies, or relationships.
FAQ
What is the difference between coarse grained and fine grained access control?
Coarse grained access gives broad permissions, such as access to an app. Fine grained access checks specific files, actions, or conditions before allowing a request.
Is RBAC coarse grained or fine grained?
rbac is often used for broad access based on job roles. It can be part of a more detailed system when combined with attribute, policy, or relationship checks.
What is the difference between RBAC, ABAC and PBAC?
RBAC gives permissions through roles, ABAC checks user and data details, and PBAC uses policies to set access rules. These models can work together when an app needs more than one type of check.
What is ReBAC and how is it different from RBAC?
ReBAC checks links such as file ownership or team membership. RBAC checks job roles, so ReBAC can help when people with the same role need different access.
Can RBAC and ABAC be combined?
Yes. RBAC can give access based on a job, while ABAC checks details such as a user's team, the type of record, or the action they want to take. Together, they can provide basic access and tighter limits
