October 2020
Intermediate to advanced
481 pages
17h 35m
English
Content preview from Network Security, Firewalls, and VPNs, 3rd Edition
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The Relationship Between Encryption and VPNs
Encryption and a secure VPN are virtually inseparable. A secure VPN exists only because the traffic is encrypted, but some trusted VPNs may or may not use encryption. To fully understand and appreciate the operations of VPNs, you need a reasonable understanding of encryption.
Encryption is just one aspect of the larger topic of cryptography. Cryptography is the art and science of changing information so it is not easily recognized or understood by unauthorized third parties. Cryptography occurs through a complementary and reversible set of processes: encryption and decryption. Encryption is the process of converting original usable data, called plaintext, into an unusable chaotic form, called
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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.