LIDS (Linux Intrusion Detection System) is a Linux kernel patch to enhance the Linux kernel. In this article, we will talk about LIDS, including what it can do and how to use it to build a secure linux system.
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Medusa is a kernel patch that improves security by providing a seamless protective layer between system resources and applications, providing access control to system resources.
David A. Wheeler is the author of the "Secure Programming for Linux HOWTO", the Linux Documentation Project's document describing how to write secure programs for Linux.
RSBAC is a serious, well-founded effort to bring formal and tested security mechanisms to Linux. Paul Robertson interviews the project founder and discusses this method of creating a more fine-grained means to control access to resources on your system.