July 2003
Intermediate to advanced
790 pages
23h 35m
English
Content preview from Secure Programming Cookbook for C and C++Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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6.19. Making Your Own MAC
Problem
You do not want to use an off-the-shelf MAC; you would prefer just to use a hash function.
Solution
Don’t do it.
Discussion
Many things can go wrong, and there’s really no reason not to use one of the excellent existing solutions. Nonetheless, some people believe they can do message authentication in a straightforward manner using a hash function, and they believe they would be better off doing this than using an off-the-shelf solution. Basically, they think they can do something less complex and faster with just a hash function. Other people think that creating some sort of “encryption with redundancy” scheme is a good idea, even though many such schemes are known to be bad.
OMAC, HMAC, CMAC, and MAC127, which we compare in Recipe 6.4, are all simple and efficient, and there are proofs that those constructions are secure with some reasonable assumptions. Will that be the case for anything you put together manually?
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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.