Abstract: A cryptographic integrated circuit including a programmable main processor for executing cryptographic functions, an internal memory, and a data transmission bus to which the main processor and the internal memory are electrically connected. The cryptographic integrated circuit also includes a programmable arithmetic coprocessor that has specific hardware arithmetic units each being designed to carry out a predetermined arithmetical operation. The programmable arithmetic coprocessor is separate from the main processor and is also electrically connected to the data transmission bus.

Abstract: This cryptographic integrated circuit 10 comprises a programmable main processor (12) for executing cryptographic functions, an internal memory (14), and a data transmission bus (16) to which the main processor (12) and the internal memory (14) are electrically connected. Moreover, it comprises a programmable arithmetic coprocessor (18) comprising specific hardware arithmetic units (30, 32, 34), each of these specific hardware arithmetic units being designed to carry out a predetermined arithmetical operation. This programmable arithmetic coprocessor (18) is separate from the main processor (12) and also electrically connected to the data transmission bus (16).