{"id":1275,"date":"2026-05-07T09:45:20","date_gmt":"2026-05-07T13:45:20","guid":{"rendered":"https:\/\/www.identiphoto.com\/blog\/?p=1275"},"modified":"2026-05-14T12:15:00","modified_gmt":"2026-05-14T16:15:00","slug":"are-proximity-cards-a-security-risk-what-organizations-need-to-know-about-legacy-credentials","status":"publish","type":"post","link":"https:\/\/www.identiphoto.com\/blog\/are-proximity-cards-a-security-risk-what-organizations-need-to-know-about-legacy-credentials\/","title":{"rendered":"Are Proximity Cards a Security Risk? What Organizations Need to Know About Legacy Credentials"},"content":{"rendered":"\n

For decades, ID badges have been a simple and effective way to control access to and within buildings.<\/p>\n\n\n\n

An employee taps a badge.
A door unlocks.
The system logs the event.<\/p>\n\n\n\n

Because the process works so seamlessly, many organizations rarely think about the technology behind the credential.<\/p>\n\n\n\n

The reality, however, is that a large percentage of access credentials still in use today were designed more than thirty years ago. While cybersecurity defenses have evolved rapidly, many physical access control systems continue to rely on credential technologies that offer little protection against cloning or unauthorized duplication.<\/p>\n\n\n\n

At the same time, buildings themselves are becoming smarter. Access control systems are increasingly integrated with identity management platforms, surveillance systems, and operational technologies across the organization.<\/p>\n\n\n\n

As this ecosystem grows, the risks associated with legacy badge technologies are becoming increasingly difficult to ignore.<\/p>\n\n\n\n

The Security Problem with 125 kHz Proximity Cards<\/strong>
<\/strong>Low-frequency 125 kHz proximity cards<\/strong>, commonly known as Prox cards<\/strong><\/a>, remain one of the most widely deployed access credentials in North America.<\/p>\n\n\n\n

They gained popularity because they were simple, reliable, and inexpensive to deploy. For many years, they served organizations well as a convenient replacement for mechanical keys.<\/p>\n\n\n\n

However, they were never designed to defend against modern security threats.<\/p>\n\n\n\n

Proximity cards operate by transmitting a fixed identification number<\/strong> to a reader. If the information matches a credential stored in the access control database, the system grants access.<\/p>\n\n\n\n

The identifier itself is not encrypted.<\/p>\n\n\n\n

If someone captures that number, it can be copied.<\/p>\n\n\n\n

Devices capable of reading and duplicating Prox credentials are inexpensive and widely available. Security researchers and physical security professionals have repeatedly demonstrated how easily these cards can be cloned using handheld RFID tools.<\/p>\n\n\n\n

From the perspective of the access control system, the copied credential is indistinguishable from the original card.<\/p>\n\n\n\n

That means a cloned badge can unlock doors, trigger access events, work in additional systems utilizing the cards, and appear in security logs under the identity of the legitimate employee who owns the badge.

A Real-World Example of Credential Cloning
<\/strong>Security analysts have repeatedly demonstrated the weaknesses of legacy proximity cards.<\/p>\n\n\n\n

In one widely referenced physical security test, researchers used a low-cost RFID cloning device to copy several proximity credentials used in real facilities.<\/p>\n\n\n\n

The cloned cards worked immediately.<\/p>\n\n\n\n

Doors unlocked.
Access events were logged normally.
The systems treated the duplicated cards as legitimate credentials.<\/p>\n\n\n\n

From the system\u2019s perspective, nothing unusual occurred.<\/p>\n\n\n\n

In reality, however, two identical credentials now existed<\/strong>, and the organization had no reliable way to determine which one was used.<\/p>\n\n\n\n

This is one of the most significant concerns with legacy credential technologies. Once cloning occurs, accountability is lost.<\/p>\n\n\n\n


<\/strong>Why Modern Security Ecosystems Raise the Stakes<\/strong>
<\/strong>The risks associated with weak credentials become even greater as organizations move toward interoperable security systems<\/strong>.<\/p>\n\n\n\n

What are interoperable security systems? Interoperable security systems are security technologies designed to work together seamlessly, even if they come from different manufacturers or platforms.<\/p>\n\n\n\n

Instead of operating in isolation, these systems share data, communicate in real time, and coordinate responses.<\/p>\n\n\n\n

Access control platforms today rarely operate as standalone systems. Instead, they are integrated with a wide range of technologies across the organization, including:<\/p>\n\n\n\n