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2.4.10 Use cases 80 Lotus Security Handbook ► Manageability of the design, including the extent of the burden of life-cycle management Architectural decisions will also drive the evaluation of prototypes and models of functions within the solution. One form of prototype is called a use case. Both security threats and normal interactions and flows can be validated with use cases. Example 1: Interception of errant packet or message flow Figure 2-14 on page 80 represents several levels of detail for the operation of an information flow control subsystem that is designed to monitor send and receive operations that cross a boundary between two networks. Figure 2-14 Boundary flow control with security subsystems
The computer systems are represented in the physical view. In the component view, an information flow control interface, positioned between source and destination, will examine one or more aspects of packets or messages sent across the boundary. Some components of this information flow control subsystem are shown in the logic view, where the monitored conditions and the programmed actions are carried out, based upon a set of rules. Valid packets are allowed to flow across the boundary; however, packets or messages of a specified format, or from an invalid source, or to an invalid destination, are disabled by the security subsystem. A record of the event is generated by invoking an interface to a security audit subsystem. This example is representative of the type of filtering, analysis, and response that is performed within packet filter firewalls, or electronic mail gateways. There are many architectural decisions to be evaluated within each iteration of the design. The effect on performance due to processing delays, plus the effect of data collection and analysis on the overall operation of the solution, are significant factors. Example 2: Three-tier client/server input flow Figure 2-15 on page 82 illustrates an input flow for a three-tier client/server process that is typical of the integration of enterprise computing with the Internet environment. Chapter 2. Security methodologies 81
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* Notes SDK include files */ #inclu
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* *********************************
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Other publications Online resources
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Lotus Security Handbook Key securit
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