February 2020
Intermediate to advanced
666 pages
15h 45m
English
Content preview from Mastering Linux Security and Hardening - Second Edition
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Hands-on lab – disabling weak SSH encryption algorithms – CentOS 7
You'll notice two things when you start working with CentOS 7:
- More algorithms enabled: A default SSH configuration on CentOS 7 has a lot more enabled algorithms than what Ubuntu 18.04 has. This includes some really ancient stuff that you really don't want to see anymore. I'm talking about things such as Blowfish and 3DES, which should have been retired years ago.
- A different configuration technique: On CentOS, placing a - sign in front of a list of algorithms that you want to disable doesn't work. Instead, you'll need to list all of the algorithms that you want to enable.
For this lab, you'll need a CentOS 7 VM and the same scanner VM that you've been using. With that in ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.