Context-Level Application Decomposition
The context level of a DFD that is used in application decomposition shows the high-level architecture for a component. Figure 11.3 shows an example of a context-level AD diagram.
This diagram shows the interface between the component and external components or entities. The vertical lines represent boundaries between the user, the machine, and the outside world. These lines will help you determine which approach to use for protecting the data. For example, if the boundary represents data leaving the machine for the Internet, you will probably want encryption ...
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