December 2010
Intermediate to advanced
363 pages
12h 21m
English
book
Pro PHP Security: From Application Security Principles to the Implementation of XSS Defenses, Second Edition
by Chris Snyder, Michael Southwell, Thomas Myer
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Random Numbers
No encryption routine is capable of being better than the key it uses, and since keys depend on the availability of truly random data, we include here a brief discussion of obtaining random data. An in-depth discussion of this topic can be found in RFC 1750 (available at http://www.faqs.org/rfcs/rfc1750.html).
The main source of randomness, or entropy, on a Unix system is /dev/random. This is a software device that outputs a more or less constant stream of binary data, based on a pseudo-random number generation (PNRG) algorithm. Because pseudo-random data is predictable if the starting number is known, the PNRG algorithm is supplemented by a buffer of random data collected over time from various system values, such as network events ...
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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.
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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.