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Highly Secure Low-cost PDA-phones

Future mobile phones will have the capabilities of Personal Digital Assistants (PDAs) or organizers. They will be open for new code, which users will be able to obtain through ubiquitous access. We must then expect that the very same security issues will arise which we know from the world of PCs on open networks. With the increase of e-commerce, security instruments such as encryption and digital signatures will be used for protecting users against attacks. Unfortunately we must expect that, once those instruments will be in widespread use, attacks against them will be aimed at. While a closed phone using security services can be fairly well protected against attacks, an open system is much more vulnerable. Today this threat may appear to be in the distant future, but this can change quickly, and then the emerging trust in security solutions is jeopardised. Therefore, it would be good to build protection into PDA-phones in the first place. This means that a novel type of computer is required, remaining secure while on an open network even when administrated by laypersons. Such a secure system will not only be secure, but also small and stable. Therefore it will result in low total cost of ownership.