Abstract: The invention concerns an integrated circuit card (1) comprising a connection and communication interface (3′) designed to set up a communication with a host unit (2) in the form of a communication device and cryptographic software means (4′) for cryptographic calculations. Said card (1) is characterised in that the integrated circuit(s) (1′) further comprise(s) a security or security-providing software layer (4) designed to co-operate with said cryptographic software means (4′) to produce a set of security operations on the received data and to transmit via the connection and communication interface (3′) of said card (1).