Manufacturers often deliberately disallow Weak IV values. This is good in that it reduces the chances of a hacker capturing weak keys, but also has the effect of reducing the already limited key possibilities further, increasing the chance of reuse of keys.
From a cryptographic point of view using master keys directly is not at all recommended. Master keys should only be used to generate other temporary keys. WEP is seriously flawed in this respect. Administration of WEP keys is not well designed and difficult to do on large networks.
Users tend to change keys very infrequently which gives a potential hacker lots of time to collect enough packets to launch an attack. WEP does have a message integrity check but hackers can change messages and recompute a new value to match. This makes the checking ineffective against tampering. Although WEP is far from an ideal security solution you should still use it. Some security is better than none. One tip on aircrack-ng is that you can use that command on the fly.
You can just run the command while airodump-ng is capturing traffic. But that also means that wireless networks nowadays are using other encryption method other than WEP, and you should never ever set up your Wi-Fi with WEP.
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Home router setting page. Surrounding wireless networks information. ARP request with aireplay-ng. Post Navigation. Your goal is to see at least , in the Data column. If you look at the RXQ column in the print screen above, you can see there number This value provides information about the quality of your wireless connection between the access point and your computer. Anything below 80 is considered weak.
If the number fluctuates a lot, you have weak signal as well. The RXQ value relates to the data stream going from the access point to your computer. Even if this number is above 80, the access point still may not be able to see your computer. This is the most common reason for fake authentication and packet injection to fail. If that is your case, just sit back and wait until the Data column shows at least ,, and then try step 7 WEP crack. Without authentication and packet injection, this process might take 1,5 - 2 hours.
You can start trying WEP crack in step 7 as soon as the Data reaches at least 80,, but our experience is that WEP keys usually get cracked once having somewhere around , initiation vectors. To crack a WEP key for a wireless access point , we need to gather a lot of initialization vectors IVs , ideally somewhere around , of them.
Normal network traffic does not typically generate these initialization vectors very quickly. Theoretically, if you are patient, you can gather sufficient IVs to crack the WEP key by simply passively listening to the network traffic and saving them step 5. Alternatively, you can use a technique called packet injection to actively speed up the process. Injection involves having the access point resend selected ARP packets they include IVs over and over very rapidly.
This allows us to capture a large number of initialization vectors in a short period of time. So, the purpose of this step is to start aireplay-ng in a mode which listens for ARP requests then reinjects them back into the network. This command will start listening for ARP requests and when it hears one, aireplay-ng will immediately start injecting it. You can generate an ARP request by pinging some other client that is already associated.
You can confirm that you are injecting by checking your airodump-ng and aireplay-ng screens. The data packets should be increasing rapidly. The ARP packets and Sent packets should be increasing rapidly as well. Possible problem: Note, if the ARP packets count and the Sent count as well are stuck at zero, then your network interface is likely not associated with your access point.
Or, you can also be too far away from the access point weak signal. Is the source mac associated? Go back to your other window from step 5 and rerun fake authentication. This is not necessary if you went through step 3 though. Once you have captured a large number of initialization vectors, you can use them to determine the WEP key. These commands will calculate WEP key from the captured initialization vectors. One such standard is WEP. So what is it and why is it bad to use?
It was introduced as a part of the original As an early-day solution, its goal was to prevent Man-in-the-Middle attacks, which it did for a time.
WEP encrypts all traffic using a 64 or bit key in hexadecimal. This is a static key, which means all traffic, no matter the device, is encrypted using the single key.
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