September 2007
Intermediate to advanced
336 pages
9h 7m
English
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Single Packet Authorization
Port knocking has shown us how to maximize the use of a packet filter to enforce a default-drop stance against all attempts to communicate with a protected service.[74] However, as shown earlier in this chapter, port knocking is not a panacea, and it has significant architectural limitations. In this section, we'll explore an alternative to port knocking that retains its benefits while avoiding its shortcomings.
Single Packet Authorization (SPA) combines a default-drop packet filter with a passively monitoring packet sniffer in a manner similar to port-knocking implementations. However, instead of transferring authentication data within packet header fields, SPA leverages payload data to prove possession of authentication ...
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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.