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Flexibility and mobility are key factors to success; up-to-the minute information and quick decisions have become more important in industry and politics than ever before. Mobile phones are often used to pass on information quickly. Users become more and more aware of the fact that enormous secu-rity
problems may arise. The usual means of communication - telephone, mobile phone, fax, mail - are the
main sources that attract data thieves. Damage caused by industrial espionage in Germany is estimated to run into at least 20 billion marks every year.
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