Radio Frequency Identification cards used for building access and payment systems create a false sense of security through proximity based authentication that's trivially defeated with cheap hardware. Tools like the Proxmark3 and Flipper Zero can read, clone, and emulate most low frequency RFID cards within seconds, allowing attackers to duplicate access credentials by simply walking past targets in crowded areas. Many organizations still deploy basic 125kHz cards that transmit static identifiers with no encryption, making them as secure as writing your password on a sticky note. Even supposedly secure HID Prox cards and hotel key cards fall victim to replay attacks and cryptographic weaknesses that researchers have documented for over a decade. The persistence of vulnerable RFID systems in high security environments demonstrates how legacy technology and misplaced trust in "proprietary" solutions continue to create massive security gaps.
#RFID #Proxmark3 #FlipperZero #physicalsecurity #hacking