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A mobile phone evolves as a data repository where the pieces of data have different owners and may thus be protected by different security policies. These pieces of data are used on an open environment controlled by a non-specialist user: the owner of the mobile phone. However, previous research projects have studied dynamic monitoring of information flows in a system. The authors believe that the results of these projects are well adapted for protecting information on an embedded system as a mobile phone. Nevertheless the difficulties to define the information flow policy that govern the information flow monitor is an obstacle for the usability of such an approach by a wide audience.
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