source NFC reader bug sweep for Flipper Zero
The Specter app for the Flipper Zero device allows users to detect active NFC readers by monitoring radio fields. It is designed to identify potential security risks like payment skimmers, though it cannot detect all types of hardware.
Why it matters
This tool provides a portable way for security enthusiasts to audit their environment for potentially malicious NFC-based hardware.
Specter: Open-source NFC reader bug sweep for Flipper Zero Specter is a Flipper Zero app that finds powered NFC readers by listening for the radio field they give off. The readers it hunts work at 13.56 MHz.
The onboard ST25R3916 carries a hardware external-field detector, the same circuit that lets the device emulate a card and register when a reader starts talking to it. Specter reads that one bit, hundreds of times a second, with its own transmitter dark.
Strength comes out of duty cycle. Over a short window the app measures what fraction of the time a carrier is present, smooths the result, and prints it as FIELD %. A reader lying against the case pegs the meter. A slow-polling one across the room nudges it.
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