Abstract
In spite of the ups and downs of the dot-com industry, open source software has become a viable alternative to commercial companies such as Microsoft, Sun, and IBM. Although open source software has its quirks and its problems, the open source movement has made its niche in the networking market. As a networking professional, it is in one's best interest to understand some of the more important security applications and services that are available. The chapter provides practical knowledge of the open source community and how it can help one with his security concerns. It teaches about several key open source sites, how the open source movement protects software instead of individuals and corporations, and reviews one's knowledge of encryption. It teaches how to verify the integrity of the files one downloads from people one does not know.
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