A card reader payment terminal including an electronic circuit including at least one printed circuit board, to which are connected electronic components, including a microcontroller designed to control different peripherals, where the microcontroller is connected to an associated microprocessor, where the card reader payment terminal is configured to receive a smart card comprising the associated microprocessor, where the associated microprocessor comprises a connector compatible with the standardized connector of smart cards for connection with the microcontroller, where the microcontroller and the associated microprocessor operate in parallel for executing a task, and where the associated microprocessor is adapted to calculate a security operation.