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Electronic commerce demands different security requirements for its many different applications. In the near future one smartcard may be used for many electronic commerce applications, such as payment systems, access to banking services and financial transactions over the Internet. A role and task based security model (R&T model) can ensure a secure access(More)
Decay-accelerating factor (DAF, CD55) is physiologically acting as an inhibitor of the complement system, but is also broadly expressed in malignant tumours. Here DAF seems to exert different functions beyond its immunological role such as e.g. promotion of tumorigenesis, decrease of complement mediated tumor cell lysis, autocrine loops for cell rescue and(More)
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