If your building still uses 125 kHz proximity (“prox”) cards or fobs, you may have an access control problem that’s bigger than “old tech.” You may have credentials that can be cloned quickly, cheaply, and without advanced skills—putting your people, property, and data at risk.
This isn’t a scare tactic. It’s a reality many organizations don’t discover until a security audit (or a breach) forces the issue.
Why legacy credentials are a real-world security issue (not a theoretical one)
Prox credentials were designed decades ago. They transmit a unique identifier to the reader—think of it like a password that gets “broadcast” when the card is presented.
The problem: that identifier can often be captured and copied.
And credential cloning isn’t limited to sophisticated attackers. Today, inexpensive RFID copying tools are readily available, and the barrier to entry is low. That means the threat isn’t just “a hacker.” It can be a disgruntled former employee, a contractor, or anyone who gets brief access to a badge or fob.
Bottom line: if your credential technology offers no meaningful protection against cloning, your access control system can’t reliably control access.
What are prox cards, exactly?
Prox (proximity) cards are contactless access control credentials that typically operate at 125 kHz. They were widely adopted because they were convenient and inexpensive.
Modern “smart” credentials typically operate at 13.56 MHz and can support stronger security features, including encryption and more advanced authentication methods.
A simple way to think about it:
- Prox = legacy identifier-based access (easy to copy in many cases)
- Modern smart credentials = designed to support stronger security controls
The real cost of “keeping what we have”
Many organizations keep legacy credentials because “it still works.” But that logic ignores the cost of failure.
A cloned credential can lead to:
- Unauthorized entry into restricted areas
- Theft or vandalism
- Safety incidents involving staff or tenants
- Exposure of sensitive data (especially if doors protect IT rooms, records storage, or regulated areas)
- Compliance issues and potential fines depending on your industry
Even if your organization has cameras, alarms, and policies—access control is the front door. If the credential is easily duplicated, the rest of your security stack is forced to play defense after the fact.
“We can’t replace everything”—good news: you probably don’t have to (all at once)
One of the biggest reasons businesses delay upgrades is the assumption that modernization means ripping and replacing the entire system.
In reality, a well-planned transition can be phased to reduce disruption and spread costs over time. Depending on your current setup, a transition plan may include:
- Prioritizing high-risk doors first (IT rooms, HR, executive areas, inventory, controlled substances, etc.)
- Migrating credentials in stages (new hires first, then department-by-department)
- Evaluating reader and controller compatibility
- Upgrading door wiring/communication where needed
The key is having a roadmap that improves security without creating downtime.
Quick self-check: are you at risk?
If you answer “yes” to any of these, it’s time to take a closer look:
- Your badges/fobs are prox (125 kHz).
- You can’t confidently say your credentials are encrypted.
- Former employees/contractors may still have working credentials.
- You’ve had badge “mysteries” (lost fobs, unexpected access events, doors found unsecured).
- Your access system is 10+ years old and hasn’t been reviewed recently.
What to do next: a practical path forward
If you’re not sure what credential technology you’re using—or what it would take to upgrade—start with a simple assessment:
- Identify credential type(s) in use (prox vs. smart credentials)
- Review the highest-risk doors and areas
- Confirm how credentials are issued, tracked, and deactivated
- Evaluate whether your system supports a phased migration plan
If you’re in South Jersey, Southeast PA, or New Castle County, DE, Systems Integrations can help you evaluate your current access control setup and map a transition plan that improves security without disrupting operations.
Want a second opinion on your credential risk? Contact Systems Integrations and we’ll help you identify what you have, what it means, and what your best upgrade path looks like.