Linux distributions can be separated into various categories based on use case and the intended target group. Server, education, games and multimedia are some of the most popular categories of Linux distros.
For security conscious users, however, there’s a growing niche of distros aimed at protecting your privacy. These distros help ensure you don’t leave a digital footprint as you go about navigating the web.
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10 of the best Linux distros for privacy fiends and security buffs | TechRadar.
Linux Security Blog 
From security point of view i mus suggest Clearos. It has a lot of beneficial points such as it was designed to be the one of the Fastest Web Proxy Rates I have seen, and File Transfers to Shares is very fast and I haven’t seen the errors I see in other Network Operating Systems. Here is the link https://www.clearos.com/
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