Technology Insights

How to Merge Multiple WLAN (IEEE 802.11) Captures into One File

I recently had a customer upload a WPA capture to our tools.question-defense.com server which failed immediately. This can happen from time to time and is for a variety of reasons Sometimes if captures does not contain all 4 eapol packets they will fail , and sometimes if a capture has lots of other wifi garbage in the .cap file it can confuse the cracking program. This last time was a new situation. After the fail I analyzed the cap file and determined that the essid was not present in the capture. This is absolutely crucial for the decrypting process. In this short article I will show how I determined the essid was not present and what I did about it.

Technology Insights

Easily Compare and Modify Like Files on Windows

There are numerous way to compare, modify, etc. two like files on Windows however using the application WinMerge will make things much easier. In the past I have opened the two files in Notepad or Notepad++, compared them, and then made the necessary changes. WinMerge is open source and created specifically for comparing similar files. There are so many benefits to using WinMerge including the ability to compare like folders (and their contents), save both filesĀ as projects, visually see location in files during the process, easily merge files, and many more. Below is a screenshot of what WinMerge looks like when comparing two PHP files.

WinMerge - Open Source - Compare or Merge Files