Enhanced short message and method for synchronising and ensuring security of enhanced short messages exchanged in_a cellular radio communication system

摘要

A communication system comprising multiple terminal equipment (1), each consisting of a terminal (4) cooperating with a microprocessor-driven user card (SIM module; 5). Each user card includes data memory (8) comprising a plurality of objects and serving as medium to at least two separate applications, the user card comprising a microprocessor (6) and ROM (7) for executing instructions pertaining to the applications. Each object contained in the user card data memory is associated with a first defined access control policy by a set of first access conditions. Each object is also associated with at least another access control policy defined by a set of at least one alternative access condition. Each alternative access condition is applicable, for the object, to group of at least on instruction pertaining to the application(s) using the other defined access control policy. Each object is also associated with a plurality of access control policy indicators each indicating, for one of the applications, which access control policy to use with the application, the control access policy indicators being stored in the data memory (8).