1. Introduction

Linus B. Torvalds wrote the first Linux kernel in 1991. Linux gained in popularity because it has always been distributed as free software. Since the source code is readily available, users can freely change the kernel to suit their needs. However, it is important to understand how the Linux kernel has evolved and how it currently works before new system programs are written.

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What is an SSL certificate?

An SSL certificate is a digital certificate that authenticates the identity of a Web site to visiting browsers and encrypts information for the server via Secure Sockets Layer (SSL) technology. Encryption is the process of scrambling data into an undecipherable format — ciphertext —, which can only be returned to a readable format with the proper decryption key.
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SELINUX (Security-Enhanced Linux)

SELinux History

SELinux was originally a development project from the National Security Agency (NSA), Secure Computing corporation (SCC) and others. It is an implementation of SCC and others. It is an implementation of Flask Operating System security architecture. As a step in its evolution, SELinux was integrated into Linux kernel using the Linux Security Modules (LSM) framework. SELinux motivated the creation of LSM, at the suggestion of Linus Torvalds, who wanted a modular approach to security instead of just accepting SELinux into kernel. SELinux in now a standard component of RHEL and non-commercial distros like Fedora, Debian GNU/Linux, Gentoo Linux etc.

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