ELI5: What are Access Badges?
It’s like a special library card you tap on a reader to unlock the door — only people with the right card can get in.
Definition
Access badges are physical authentication tokens—typically RFID cards or smart cards—used to control entry to buildings, rooms, or secured areas. They work by transmitting a unique identifier to a reader, which then grants or denies access based on configured permissions. Access badges are a key component of physical security and are often integrated with visitor management and audit logging systems.
Key Details
- RFID badges use radio frequency to communicate with readers without physical contact; smart cards contain embedded chips that may require contact or proximity.
- Badge data (card number, facility code) can be cloned if not protected—proximity card cloning is a known attack vector.
- Access control systems log badge swipes, providing an audit trail for physical access to sensitive areas.
- Badge issuance and revocation must be tied to HR processes (onboarding/offboarding) to prevent orphaned credentials.
- Multi-factor physical access combines badges with PINs or biometrics for higher-assurance environments.
Connections
- Parent: physical-security — part of physical security controls for building access
- See also: access-control-vestibules-mantraps