The weakness you are experiencing is not in WEP per se but in the algorithms used to generate the hex key from other easy to remember, easy to crack sources such as dictionary words.
Furthermore, even on non dictionary words, some of these algorithms have serious flaws that greatly reduce the amount of keyspace you need to search to find a really bit key. If you want a secure password, get bits of sufficiently random data, convert it to hex and use that. Rotate it every few weeks or so. A more fun solution? Run one VLAN as a public honeypot with open access to nothing.
This is revealing, but also odd that WEP security is being discussed at all. Is it really true that you are able to crack bit WEP encryption on a wireless network just by reading off the packets over the signal? So the question I have to ask is was your password a dictionary password?
No other security is necessary. Which GPS unit have you been using? It was an Airport card in a Macintosh. As far as WEP vs. Anyone who knows anything about security can tell you wep is handing out your password, it broadcasts your password acrossthe network so anyone can crack it, wpa on the other hand if you have a truely random password with the maximum allowed charachters is unbreakable.
I suggest you listen to Security Now podcast starting with episode one. Also please not that your mac address is being broadcast as well so even if you restrict mac addresses they can esily be spoofed even with the software that comes with your adaptor so all one has to do is find out what valid mac addresses are on the network and just start using one. MAC addresses are actually not encrypted when sent over the air, since they are the only reliable way of identifying a peer.
Getting them from network traffic is trivial and only needs a couple of frames. MAC addresses are also trivial to spoof. On Linux it is just a configuration file to tweak.
On my WRT54G it is a configuration option. This effectively shuts down all Wifi traffic for good on the access point.
MAC filtering is close to useless as a serious security feature. He knew this, of course, because they were all broadcasting their SSID, usually with a business name!! BTW, MAC address locking is nice, but anyone with a basic knowledge of networking and a good sniffer could spoof your MAC address in probably less time than it takes to read this. As above — a mac address is actually easier to hack than — much easier — than WEP — which at least takes a little effort.
A dictionary attack takes only a few packets but to defeat that all you need to do is make up fake words with special characters. An easy way to do that would be to disassociate someone who is on and watch them reconnect. I think the real question is whether or not you have something worth stealing. Mac spoofing is almost quicker than cracking web please dont rest easy with that as an alternative there is no reason to not be running wpa as of right now there isnt a good quick way to crack it..
The MAC address isssue is well documented. As is the WEP issue. WPA is more secure but serious crackers can find a way through that too.
Take solace in the fact that people looking for an unsecured wireless network will generally settle for the first one they can crack, so if you use both MAC addresing and WPA the likelyhood is they will crack you naber who uses neither.
Just a suggestion, setup a vpn. For those a little more tech savvy and want a little bit of fun buy a firwall such as a pix. There was a really good article too on digg where you deploy a squid proxy in your wireless zone where it will invert all the graphics on the web and will really screw people up who hack into your network. WEP is out now as Cam said above. WPA is supposed to be better but a simple google search will show you people have already worked around this as well.
So are there any similar programs for windows? I agree with cYrus… it is very simple to spoof a mac address and very easy to find what mac address you need to spoof..
I have a laptop with built in wireless that has the ability to spoof mac addresses built into the driver.. As many of you have stated Mac Filtering is completely useless, spoofing a Mac Address takes seconds. Allowing you access to the network. WEP is useless. As stated, using either a weak dictionary word or a fully randomized passphrase only slightly increases the amount of time required to crack it by a slight margin. Check out CoWPAtty. For those stating that Broadcom cards can not be used to crack WEP you are partially correct.
I have purchased and returned a ton of external adapters until finding this one that works. Cracking WEP does not depend on brut force; it basically reads the packs generated by the users on the network and build the pass phrase from those…. The whole thing is flawed. So do not use WEP. Aside from everyone saying WEP is now replaced by WPA, which it is and should be in any wireless network, alot of people are commenting saying that mac address filtering will protect you.
So I go to Google. Type a couple of search terms and, Google being Google, I get the standare 1. One of them being this page. Should be interesting I think. What was accomplished here was a simple brute force password hack. A password hack is one of the most basic routines there is in the security field, even with the standard three strikes lockout, so this is assuradly a lesson in why it is necessary to use strong passwords.
PowerBook users have real problems with WPA. I have a DLink router that has been re-installed many times. WPA would be nice, but it goes deaf about every 5 minutes. Cracking WEP is not a new thing, because of weakness in its design. Same key is used forever until one fine day you decide to change it! Also remember that bit key is not exactly is just a marketing number! Remaining 24 bits are called Initialization vector IV , this IV is incremented for every packet and this IV is combined with your password to make it bit and IV is visible to anybody with a sniffer, coz it is sent with the packet without any encryption.
Most important point: password that you enter, is finally used for encryption. Built in mechanism for rekying. New key is generated for every packet: so if you are able to crack key for one packet. There is nothing useful u can do. Password that u enter is not used for encryption, it is used with lot of other info. WEP or bit encryption is like locking your screen door with a bathroom key. WEP is like locking your front door with an easily pickable deadbolt. WPA is like actually having a fairly secure door.
The strongest WPA makes your door more secure than your walls. This a brute force passphrase hacking, not some kind of wire sniffing trick which is what WEP is vulnerable to, and takes a fair bit longer than 60 seconds. You need to use a secure passphrase otherwise you are vulnerable to somebody guessing your passphrase. So, please, people, stop thinking that WPA is the holy grail of security. And of course, MAC filtering is basically useless, except as part of security in depth.
Shawn, in your video, you are using a standard dictionary to crack your password. If you want to have a secure network, then you use all of the bits or 64 ASCII characters of the passphrase to encrypt it who sais you need to be able to remember it, just create a completely random key and write it down. Having in mind that an up-to-date processor with 3 Gigahertz can do 3 operations per second, you can imagine how many..
In response to you not using a wireless network anymore, you should just use Mac address authentication or blocking. Just have your computers in the Mac address area of the router. It gives you the same wireless security big companies and government use WPA-Enterprise for 9. None of that other stuff works. Your AP must be able to support the enhanced security, but most all newer last 3 years do such as most Linksys, D-Link, and Apple…as well as many others.
It also supports Check out this howto for building a Radius Server to use with your wireless network. It uses WPA-Enterprise which rotates the key every couple of minutes. About as secure as you can reasonably be at the moment!
Setup a linux box with 2 network cards in it. Install OpenVPN on the client and setup to tunnel everything. Use OpenVPN to close the bridge between the internal and external networks. They wont crack an IPSec tunnel with a key lifetime of 60 minutes. Dont trust others with your security trust only yourself. Only more secure then you. Wired home networks are virtually immune to interference, covert tapping, or the other hassles associated with wi-fi. Old school still rules!
I agree. I have packets right now.. Now that everyone has chipped their two cents on wireless security, could you tell me which GPS unit have you been using? I looked at cracking WEP a while back and it really takes Linux with two network cards. But why waste time on your little home network that has letters to grandma?
The serious crackers go after the companies where they can actually use the information they retrieve. And if they wanted to retrieve info from home networks, why not pick one of the millions of unsecured home networks out there you can find in any neighborhood? That means you really only have to be concerned about the person who has a little bit of knowledge and wants to experiment.
You deserve whatever happens after that! I was trying to crack my home network — WEP enabled and Why is that? Do I need to use the Airport too so I can gather more packets? Please reply to my email or something like that.
Has anyone out there managed to sort the problem or is there an update on the way? Install OpenBSD and write your firewall rules to use authpf for authentication on the gateway. Now, someone has to authenticate with ssh to your router or wifi AP before they can go anywhere. You can even direct non- authenticated users to a web server that comes with the default OpenBSD installation with a page telling them whatever you want.
You can even have an open access point but put the wireless interface on a subnet isolated from your regular network. I just finished mine and it rocks! I doubt that will take 60 seconds more like 24 hours on a brute force attack on a hard hitting dual processor machine. It is not heuristic or even statistical it is definite, it just takes time. Thats my understanding anyway….
I am with some software get some Mac Address, but How to running three Mac Address on one machine or more? If you are using either Auditor or Backtrack, slackware based distributions of linux, you are capable of breaking into both. Anything can be broken, regardless of how strong we believe the encryption is, some just require more technical know-how. Many people believe that MAC address selection is a safe-way to eliminate any hacker from entering your network.
Unfortunately, the above mentioned distributions of linux are capable of detecting, deauthorizing, and spoofing known MAC addresses on the network. Besides, if your goal is to break into Wifi on the road, understand that it is a crime to break in.
If you have any cellphone company, consider saving yourself the time from actually learning how to operate your computer and get an EDGE enabled wireless card and have broadband speed Internet wherever you go, without the risk of breaking the law, or the effort. To test the validity of this article, I attempted to break into my own network. To simulate a home environment, I turned off all but one of my computers on wireless and in about 10 minutes it is possible… remember this article assumes massive network traffic is continuous, which we know not to be the case in any wireless network that is not heavily populated.
Frankie: Get real, breaking into Wi-Fi security has nothing to do with your linux distro. You can do this on all kind of linux flavors Mac as well, as this post proves , and there exists plenty of different software and wifi chipsets to use. WPA is still considered pretty secure, but it is not uncrackable, instead of launching a full frontal attack on the crypto it is possible to de-authenticate users and record their authentication attempts and break it from there.
Step 1 - Start the wireless interface in monitor mode on AP channel. Step 3 - Start airodump-ng to capture the IVs.
Step 4 - Use aireplay-ng to do a fake authentication with the access point. Step 5 - Start aireplay-ng in ARP request replay mode. Step 6 - Run aircrack-ng to obtain the WEP key. First, this solution assumes: You are using drivers patched for injection. Use the injection test to confirm your card can inject prior to proceeding.
You are physically close enough to send and receive access point packets. Remember that just because you can receive packets from the access point does not mean you may will be able to transmit packets to the AP. The wireless card strength is typically less then the AP strength. So you have to be physically close enough for your transmitted packets to reach and be received by the AP.
You should confirm that you can communicate with the specific AP by following these instructions. There is at least one wired or wireless client connected to the network and they are active. The reason is that this tutorial depends on receiving at least one ARP request packet and if there are no active clients then there will never be any ARP request packets.
You are using v0. If you use a different version then some of the common options may have to be changed. Here are the basic steps we will be going through: Start the wireless interface in monitor mode on the specific AP channel.
It should look similar to this: lo no wireless extensions. The system will respond: lo no wireless extensions. Enter: aireplay-ng -9 -e teddy -a C:7E ath0 Where: -9 means injection test. Open another console session to capture the generated IVs.
Then enter: airodump-ng -c 9 --bssid C:7E -w output ath0 Where: -c 9 is the channel for the wireless network. This eliminate extraneous traffic. To associate with an access point, use fake authentication: aireplay-ng -1 0 -e teddy -a C:7E -h F:BAC ath0 Where: -1 means fake authentication.
The long period also causes keep alive packets to be sent. Default is multiple and this confuses some APs. Some access points are configured to only allow selected MAC addresses to associate and connect.
If this is the case, you will not be able to successfully do fake authentication unless you know one of the MAC addresses on the allowed list. If you suspect this is the problem, use the following command while trying to do fake authentication. Start another session and…. If at any time you wish to confirm you are properly associated is to use tcpdump and look at the packets. Open another console session and enter: aireplay-ng -3 -b C:7E -h F:BAC ath0 It will start listening for ARP requests and when it hears one, aireplay-ng will immediately start to inject it.
Read packets got ARP requests , sent packets Is the source mac associated? All your injected packets will be ignored. You must return to the fake authentication step Step 3 and successfully associate with the AP.
This is optional since when we originally captured the data, we applied a filter to only capture data for this one AP. Be sure to read all the documentation on the Wiki for the various commands used in this tutorial. How long does the cracking process take? I imagine this takes substantially longer. It's not viable for those random ish digit passwords most ISPs will use.
Qub3d on July 24, parent next [—].
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