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Mobile systems and applications are raising some important information security and privacy issues. This paper discusses the need for privacy and security in mobile systems and presents technological trends which highlight that this issue is of growing concern. Access to general purpose Information and Communication Technology (ICT) is not equally distributed on the authors' planet: developed countries represent about 70 percent of all Internet users while its percentage of Internet hosts has raised from 90 percent in 2000 to about 99 percent in 2002.
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