April 2002
Intermediate to advanced
752 pages
21h 26m
English
book
Network Security: Private Communication in a Public World, Second Edition
by Mike Speciner, Radia Perlman, Charlie Kaufman
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5. Hashes and Message Digests
5.1. Introduction
Random numbers should not be generated with a method chosen at random.
—Donald Knuth
A hash (also known as a message digest) is a one-way function. It is considered a function because it takes an input message and produces an output. It is considered one-way because it's not practical to figure out what input corresponds to a given output. For a message digest function to be considered cryptographically secure, it must be computationally infeasible to find a message that has a given prespecified message digest, and it similarly should be impossible to find two messages that have the same message digest. Also (which follows from the previous properties), given a message it should be impossible to ...
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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.