Security system

A terminal for use in a retail banking system comprises an interface for receiving multiple types of personal authentication elements. An authentication request for a user is associated with one or more of these types of element. The terminal also comprises a security module for providing access to a plurality of different access spaces of the system, each space comprises a different respective function or combination of functions of the system. For each access space, the security module provides a mapping between that access space and a respective one or more of the types of personal authentication element. Based on this mapping, the security module is thus configured to grant the user with access to one of the access spaces on condition of being mapped to the one or more types of personal authentication element associated with the authentication request for the user, and on condition those elements are verified.