Graph Theory

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By N. Biggs

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We argue that it is not enough to merely define the user, but rather usable software is better achieved through utilizing the user throughout the design and development process; and we believe this can be accomplished for the security visualization projects in part through the use of personas. In short, a persona is an archetypical user that captures a range of user needs in a coherent narrative (Cooper, 1999). The basic idea behind a persona is that one can Adapting Personas for Use in Security Visualization Design 41 design for a range of users by designing for a single fictional user called a persona which effectively becomes the representative user by embodying the needs of the selected user population (Cooper, 1999).

The majority of analysts in the CND CTA performed triage analysis. It is also very common that novice CND analysts are first assigned the job of triage analysis and work under the guidance of more senior analysts. The triage cases that novices encounter provide on-the-job training that increases the range of security violations that they can easily recognize. Triage analysis is reactive in nature, since it is based on reviewing and sorting activity that has already occurred. Within the CTA, we encountered the following relevant CND job titles: level 1 analyst, first responder and real-time analyst.

What questions are you likely to ask? Am I under attack; what is its nature and origin? What are the attackers doing; what might they do next? How does it affect my mission? What defenses do I have that will be effective against this attack? What can I do about it; what are my options? How do I choose the best option? ” (Saydjari, 2004). The Real Work of Computer Network Defense Analysts 21 To answer these questions, CND analysts are responsible for tasks such as collecting and filtering computer network traffic, analyzing this traffic for suspicious or unexpected behavior, discovering system misuse and unauthorized system access, reporting to the appropriate parties and working to prevent future attacks.

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Algebraic Graph Theory by N. Biggs

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