A secured data transaction system (10) comprising a Smart Card Interface (SCI) (12) for interfacing between a local device (25, 26) and a Remote Secure Application Module (RSAM) (14) located remote from the SCI for processing data from smart cards. The SCI (12) comprises an SCI memory (28, 35) containing a predetermined instruction set, an SCI processor (15) coupled to the memory for operating in accordance with said instruction set, and a first SCI communication interface (16) coupled to the SCI processor for allowing bi-directional contactless communication between the SCI and the RSAM. The RSAM (14) comprises an RSAM memory (21) containing a predetermined instruction set and comprising a secured area reserved for security applications and for secure storage of data related thereto, an RSAM processor (20) coupled to the RSAM memory for operating in accordance with said instruction set, and an RSAM communication interface (19) coupled to the RSAM processor for allowing bi-directional contactless communication between the RSAM and the SCI. In such an arrangement data associated with the smart card interface (12) may thus be stored in the RSAM memory (21) remote from the smart card interface.