What it is
Application allow-listing (aka “only these apps may run”) is a safety rule for your devices. You create a small, approved list of programs—and everything else is blocked by default. If it’s not on the list, it doesn’t launch.
Why it matters
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Stops malware cold: unknown files can’t execute.
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Shrinks attack surface: fewer ways in, fewer surprises.
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Raises trust: every running app is known and vetted.
How it works (30-second version)
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You approve apps by path, publisher signature, or file hash.
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The system checks each launch against the policy.
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Updates are handled with rules (e.g., allow signed updates from the vendor).
Where it shines
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Servers, admin workstations, POS/kiosks, shared school or library PCs.
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Teams handling sensitive data or high-risk roles.
Gotchas (plan for these)
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Updates break if rules are too strict—build an update path.
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Power users/dev tools may need exceptions or a “developer mode.”
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Shadow IT gets surfaced—have a fast request/approval workflow.
Rollout quick plan
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Audit what actually runs (baseline your fleet).
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Draft rules: prefer vendor signature + known paths; hash for high-risk tools.
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Pilot in monitor mode to see blocks without enforcing.
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Enforce gradually; review requests and tune.