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An open and accurate accounting of the available intelligence for an individual, organization, or business is typically an undervalued component of both offensive and defensive information security activities. From the defender.s perspective, it is important to understand how the source, content, and fidelity of publicly available data can affect the overall security posture of the organization. For the attacker, the gathering and analysis of publicly available data, which often includes usernames, emails, hostnames, subnets, technologies deployed, new product initiatives, employee habits, hobbies, and relationships, will provide actionable intelligence products that can be leveraged to gain a foothold in the target organization and provide the foundation for a successful attack. This presentation will cover intelligence sources, gathering and analysis methods, and the supporting toolset. Individual use cases will highlight how a specific piece of information can be developed into an actionable intelligence product that can then be incorporated into a larger attack plan. This presentation also provides suggestions for limiting, detecting, and mitigating against the information that is made available to the public.