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Security in enterprise resource planning systems and service-oriented architectures

IT systems and applications based on security services are heterogeneous: the various individual components may be built using different technology and run in different environments. Nevertheless, the components — as well as their requirements — interact, and in some cases even interfere with each other. Still most currently existing security solutions are limited to protecting applications within a single security context. Moreover, the message-passing nature of interactions of Web Services and of security services in general, increases their vulnerability. IT systems and applications, as well as their security requirements, are in general not static but rather continuously evolving. Their interaction takes place in highly dynamic environments where the composition of services can be undertaken at runtime. Some policies are dynamically modified (e.g., for incident handling or in case of emergency), and principals may join or be excluded from a community sharing some security context.