Fastflux makes for some cool graphs
Data visualization is incredibly useful in not only tracking down anomalous behavior on a network but also for displaying metrics and data to the non technical folks. Visualizing data from a security perspective can show some interesting and valuable information.
Take NetFlow logs for example. While there is no payload information, if you're able to gather the logs from an entire network you can determine everything from infected hosts scanning your network to attacks against a web application.
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