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Securing Linux, Part 3: Hardening the system

developerWorks has an introductory article on hardening a Linux system. "In this series of articles, learn how to plan, design, install, configure, and maintain systems running Linux in a secure way. In addition to a theoretical overview of security concepts, installation issues, and potential threats and their exploits, you'll also get practical advice on how to secure and harden a Linux-based system. We will discuss minimal installation, hardening a Linux installation, authorization/authentication, local and network security, attacks and how to protect against them, as well as data security, virus, and malware programs."
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