Book Image

Mastering Wireshark

Book Image

Mastering Wireshark

Overview of this book

Wireshark is a popular and powerful tool used to analyze the amount of bits and bytes that are flowing through a network. Wireshark deals with the second to seventh layer of network protocols, and the analysis made is presented in a human readable form. Mastering Wireshark will help you raise your knowledge to an expert level. At the start of the book, you will be taught how to install Wireshark, and will be introduced to its interface so you understand all its functionalities. Moving forward, you will discover different ways to create and use capture and display filters. Halfway through the book, you’ll be mastering the features of Wireshark, analyzing different layers of the network protocol, looking for any anomalies. As you reach to the end of the book, you will be taught how to use Wireshark for network security analysis and configure it for troubleshooting purposes.
Table of Contents (16 chapters)
Mastering Wireshark
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Usual and unusual WEP – open/shared key communication


Here, we will discuss two types of Wired Equivalent Privacy (WEP) authentication procedures: open and shared keys. As a matter of fact, discussing WEP is really unnecessary, but we should be aware of how it works because you never know when you might be asked to troubleshoot an old router whose firmware is still not upgraded and just supports WEP as an authentication mechanism.

WEP-open is way better than WEP-shared because even when the password that you provide turns out to be wrong, you will get connected to the network; here, it reduces the chance of getting the router brute forced. If you are using WEP-shared communication, then an experienced hacker won't take more than 2 minutes to crack your strongest key, and because of the small pool of keys that WEP supports, your password won't last long.

So, to begin with, we need the infrastructure to capture packets that are required for WEP-open. A key point to note here is that the infrastructure...