Access Control Credentials Compared
A credential is what a person uses to open a door — a proximity card, smart card, fob, PIN, mobile phone, or fingerprint. They differ mostly in security and convenience. Old proximity cards are cheap but easy to clone; smart cards, mobile credentials, and biometrics are far harder to copy. Here is how they stack up.
Credential comparison
| Credential | Security | Convenience | Notes |
|---|---|---|---|
| Proximity (prox) card | Low | High | Cheap, but can be cloned |
| Smart card | High | High | Encrypted, hard to copy |
| Key fob | Low–Medium | High | Same tech as cards |
| PIN code | Low | Medium | Free, but codes get shared |
| Mobile (phone) | High | Highest | Encrypted, nothing to hand out |
| Biometric | Highest | High | Can’t be shared or lost |
Proximity cards and fobs
The classic tap-to-enter credential. Cheap and easy, but older 125 kHz prox cards send an unencrypted number that can be copied with a cheap device. Fine for low-risk doors; not for high-security areas.
Smart cards
Smart cards (like 13.56 MHz encrypted cards) protect their data with encryption, so they are very hard to clone. This is the modern standard for card-based access.
PIN codes
A number typed on a keypad. Nothing to carry, but codes spread among staff and should be changed often. Best on low-traffic back doors.
Mobile credentials
Your phone becomes the key. Credentials are encrypted, you can issue or revoke them instantly from software, and there is nothing physical to lose or hand off. Great for high-turnover teams.
Biometric credentials
A fingerprint or face. The credential is the person, so it cannot be shared, lost, or copied. Best for the most sensitive rooms. Learn more about biometric access systems.
Can you require two credentials?
Yes. For high-security doors you can require two factors — a card and a PIN, or a phone and a fingerprint — so one lost credential isn’t enough to get in.
Which credential should you choose?
- Standard office doors: smart card or mobile.
- Back doors: PIN or card.
- High-security rooms: biometric, or two factors.
- High staff turnover: mobile, for instant issue and removal.
Compare full systems in our guide to the types of access control.
Frequently Asked Questions
What is the most secure access control credential? Biometrics and encrypted mobile credentials — they can’t be easily copied or shared.
What is the difference between a prox card and a smart card? A prox card sends an unencrypted number and can be cloned; a smart card encrypts its data and is far harder to copy.
Are mobile access credentials secure? Yes — they are encrypted and can be revoked instantly, with nothing physical to lose.
Golden Locks helps Orange County businesses pick the right credential for each door — and installs the keycard or biometric readers to match. Call (714) 841-0141 for a free assessment.
By Omar, Licensed Locksmith & Access Control Specialist — CA Lic. #LCO4446 / #988707.