Upgrade “Prox” Fobs to Mobile Credentials
Why it matters and how to tell what you have
If your doors still open with older “prox” fobs, your access control may be easier to copy than you think. Prox refers to a legacy 125 kHz RFID (Radio Frequency Identification) technology that can be read and cloned with off-the-shelf tools. Modern options include encrypted 13.56 MHz cards or fobs and
mobile credentials on phones or watches. These raise security, simplify day-to-day management, and reduce risk. In this blog, we’ll explain the differences, explain why prox is being phased out, and help you identify your reader.
What “Prox” Actually Means and Why It’s Outdated
“Prox” refers to an older 125 kHz RFID technology that was once standard for access control. It replaced swipe cards and allowed users to unlock doors by holding a fob near a reader.
The problem is that prox credentials are not encrypted. They can be scanned and copied with inexpensive devices, often without the user noticing. Inexpensive and easily accessible tools make this process easy, which puts buildings using prox at risk.
Modern 13.56 MHz technologies like MIFARE, DESFire, and HID iCLASS use encryption that prevents duplication. Manufacturers such as Brivo have already stopped selling prox fobs/cards, signaling that this technology is being phased out.
Why Businesses Should Upgrade
Upgrading from prox to modern credentials is about more than convenience. Older prox systems are vulnerable, harder to manage, and becoming obsolete. Modern encrypted credentials and mobile access provide stronger protection and better long-term value.
Key reasons to make the switch:
- Stronger security: Prox fobs/cards can be cloned, while encrypted cards and mobile credentials are far more secure.
- Reduced risk: Lost, stolen or shared fobs can lead to unauthorized access.Mobile devices are less likely to be shared.
- Regulatory readiness: While not always required by law, industries that handle controlled substances, pharmaceuticals, cash, or sensitive data benefit from higher security standards.
- Future-proofing: Manufacturers are phasing out prox technology. Upgrading now avoids scrambling later when replacements are no longer available.
- Comparable costs: Modern fobs cost about the same as prox, and mobile credentials are subscription-based at a low per-user rate. Replacing readers is often straightforward and can be done door by door.
How to Identify Your System
It can be difficult for non-experts to tell if a system uses prox just by looking at a card or reader. Prox fobs/cards often say “Prox” on the front in small print, and common models like the HID Prox Card II or HID Mini Prox readers are good indicators.
If you are unsure, the simplest approach is to ask your access control provider. A professional can quickly determine what technology your system uses and recommend the right upgrade path.
Ready to Upgrade?
Modernizing your access system protects your building, simplifies credential management, and positions you for the future.
If you are unsure what type of system you have, reach out to our team. We can identify your current technology, explain your options, and help you plan an upgrade that fits your budget and timeline.
Contact the team at Assured Security to get started.
