3/19/2021 0 Comments Wpa Psk2
Edit - Preferences - Protocols - IEEE 802.11 - Ignore the Protection bit: () yes with IV - ()Enable decryption - Decryption keys: Edit - New - key type: wpa-pwd - key 12345678:myssid - ok - Apply - Apply.This is useful when you study (my case for CWSP studies) different security protocols used in wireless.Here is the basic topology for this post.Otherwise you can simply use application like InSSIDer to see which channel given SSID is operating.I am using 5GHz therefore get 802.11a summary here (If you want sniff 2.4GHz, then you can issue command with 802.11b).
Wpa Psk2 How To Do ItI have used BackTrack with USB adapter to take this packet capture ( Refer this youtube video for how to do it ). It is just simple 2-3 line configuration required to set up a USB adapter as monitor interface for wireshark. Now if you analyze this you would see 4-way handshake ( EAPOL-Messages 1 to 4 ) messages exchanged after Open Authentication phase finished ( Auth Request, Auth Response, Association Request, Association Response ). Once 4 way handshake is completed, both client AP having required key for data encryption. So that point onwards all your data frames (not management frames, null frames) are encrypted using CCMPAES. As you can see below, data frames are encrypted you cannot see what traffic it is. Before we go decrypt these messages, it is very important to understand that you have to properly capture 4-way handshake messages in your sniffer in order to decrypt using wireshark. If you are not capture M1-M4 messages successfully, wireshark will not be able to derive all the keys to decrypt rest of that data. Here is one example where all the frames has not been captured properly in 4-way handshake process (This happened when I was using same USB adapter with Fluke WiFi Analyzer) Now you have to go to Edit - Preferences - Protocol - IEEE 802.11 need to Enable Decryption checkbox. Then click on Edit Decryption Keys section add your PSK by click New. You have to select Key-type as wpa-pwd when you enter the PSK in plaintext. You can simply enter the plaintext password only (without SSID name).In this case wireshark try to use last seen SSID, It is always good practice to use password: SSID. Here is the same frame (103) which you saw earlier in encrypted format, but now wireshark able to decrypt it. Now if you look further you will see the client is getting IP through DHCP ( DORA Discover, Offer, Request, ACK ) then register to a CME ( SKINNY protocol) then establish a voice call ( RTP ) details. I find this post really helpful for studying towards a CWSP exam. Wpa Psk2 Download And BacktrackI like the inSSIDer tool but Ive been having a problem to download and backtrack to a USB drive. I find the installation instruction very confusing, I have a Windows 7 machine but I have not been successful at downloading backtrack. I am trying to study the 802.11i. I would like to capture and see encrypted frames, specially DHCP request frames. But how can I do for capture and see others encrypted frames. After following your post, using Wireshark and decrypted the QoS frames and can see the DHCP discover.
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