Proxmark3 is a multi-purpose hardware tool for radio-frequency identification (RFID) security analysis, research and development.

[2] The original Proxmark3 hardware platform served as the basis for new device versions, including commercial ones.

Proxmark3 is based on field-programmable gate array (FPGA) technology, which allows the implementation of high-performance low-level analog signal processing, modulation and demodulation.

Initially, both antennas were connected with a shared 4-pin Hirose USB connector, which was unreliable at times.

Field-programmable gate array does both the low-level modulation when transmitting data from CPU and demodulation when receiving a signal from an ADC.

[5] Proxmark3 software is divided into three parts: Older firmware used USB HID protocol to connect the client to the Proxmark3.

CPU received a command from the client, executed it and stored the result in the memory buffer.

Proxmark3 community has seen rapid growth after the release of firmware supporting the ISO/IEC 14443-A standard and appearing successful attacks on Mifare Classic.

[8] The community Discord server was later created to host both text and voice discussions on the topic of EAC system security.