October 2002
Intermediate to advanced
206 pages
8h 30m
English
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The User-Password Shared Secret
Since the
User-Password
attribute is protected by a stream
cipher, as described earlier, it’s certainly
possible for attackers to obtain information on the shared secret if
they can sniff network traffic and try to authenticate against a
RADIUS server. For example, an attacker could attempt to authenticate
using a password known to him. He then receives and captures an
Access-Request packet and uses a hash on a
combination of the protected portion of the
User-Password and the password he originally used.
Once that computation is complete, he has the result of the MD5
(shared secret + request authenticator) operation. He already knows
the request authenticator from his original request, so he can now
use a brute-force attack on the shared secret and determine it
offline.
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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.