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BackTrack 5 Wireless Penetration Testing Beginner's Guide

You're reading from   BackTrack 5 Wireless Penetration Testing Beginner's Guide Master bleeding edge wireless testing techniques with BackTrack 5.

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Product type Paperback
Published in Sep 2011
Publisher Packt
ISBN-13 9781849515580
Length 220 pages
Edition 1st Edition
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Author (1):
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Vivek Ramachandran Vivek Ramachandran
Author Profile Icon Vivek Ramachandran
Vivek Ramachandran
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Table of Contents (18) Chapters Close

BackTrack 5 Wireless Penetration Testing
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
1. Wireless Lab Setup FREE CHAPTER 2. WLAN and Its Inherent Insecurities 3. Bypassing WLAN Authentication 4. WLAN Encryption Flaws 5. Attacks on the WLANInfrastructure 6. Attacking the Client 7. Advanced WLAN Attacks 8. Attacking WPA-Enterprise and RADIUS 9. WLAN Penetration Testing Methodology Conclusion and Road Ahead Pop Quiz Answers Index

AP-less WPA-Personal cracking


In a previous chapter, we have seen how to crack WPA/WPA2 PSK using aircrack-ng. The basic idea was to capture a four-way WPA handshake and then launch a dictionary attack.

The million dollar questions is—would it be possible to crack WPA-Personal with just the client? No access point!

Let's revisit the WPA cracking exercise to jog our memory.

To crack WPA, we need the following four parameters from the Four-Way Handshake—Authenticator Nounce, Supplicant Nounce, Authenticator MAC, Supplicant MAC. Now the interesting thing is that we do not need all of the four packets in the handshake to extract this information. We can get this information with either all four packets, or packet 1 and 2, or just packet 2 and 3.

In order to crack WPA-PSK, we will bring up a WPA-PSK Honeypot and when the client connects to us, only Message 1 and Message 2 will come through. As we do not know the passphrase, we cannot send Message 3. However, Message 1 and Message 2 contain all...

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