A tutorial for a Unix newbie or semi-newbie who is interested in computer security and/or networking. Basic Local/Remote Unix Security: Change default configurations, basic packet filtering, how to secure your system’s networking services (or completely remove them or some of them, in case you don’t need them, in order to increate your computer’s security), how to use, how to avoid trojans, what are sniffers, how to maintain local security between different users in your system (if you’re not the only one using this system, whether it’s locally or remotely), some stuff about SSH, how to protect yourself against computer viruses under the Unix system, what are security scanners and how to use them, why you should encrypt your important data and how etc’.
You can download it from the following link: https://packetstormsecurity.com/files/download/11416/unixsec.txt
Source: https://packetstormsecurity.com/files/11416/unixsec.txt.html