Li-Fi is 100 times Faster than Wi-Fi Technology: Real-World Tests Prove

Yes, it's time to shift from Wi-Fi to Li-Fi — an alternative technology that is 100 times faster than the average speeds of Wi-Fi.

Scientists have just field-tested the new wireless technology called Li-Fi for the first time and achieved marvelous wireless speeds that are 100 times faster than current WiFi speeds.

What is Li-Fi Technology?

Li-Fi is a new wireless technology that transmits high-speed data using light (i.e. Visible Light Communication or VLC) rather than radio bands.

In short, Li-Fi is a Super-Fast alternative to Wi-Fi.

Earlier this year, scientists achieved mind-blowing speeds of 224 gigabits per second (Gbps) in the lab using Li-Fi. It's believed that this technology has the potential to change everything about the way we use the Internet today.

And Yes, it will.

Test Results: Li-Fi is 100 times Faster than Wi-Fi

An Estonian startup company called Velmenni took the technology out of the laboratories and into the real-world offices, and industrial environments in Tallinn for the first time and, believe me, it's really, really fast.

The company was able to transmit data at 1GB per second, which is almost 100 times faster than the Wi-Fi speeds.

"We are doing a few pilot projects in different industries where we can utilize the VLC technology,"Velmenni's CEO Deepak Solanki told IBTimes UK.
"Currently we have designed a smart lighting solution for an industrial environment where the data communication is done through the light. We're also doing a pilot project with a private client where we're setting up a Li-Fi network to access the Internet in [our] office space."

Unlike Wi-Fi network signals, Li-Fi is based on light and can't penetrate through walls, which makes it more secure from external sniffing. Meanwhile, it also means there is less interference from other devices.

Who Invented Li-Fi?

The Li-Fi technology was originated in 2011 by German physicist Harald Haas, who outlined the idea of using light bulbs as wireless routers during a TED Talk. He demonstrated that with a flickering light from an LED, one could transmit more data than a cellular tower.

You can watch the full video of Haas talk about the Li-Fi technology in 2011 given above.

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HOW TO CRACK WI-FI PASSWORD IN UBUNTU?

For this purpose we are going to use Ubuntu. First we have to install air-crack program in o.s

(1)install aircracksudo apt-get install aircrack-ng

(2) You need to go in root first. For this purpose type “su –“ and type your password.

(3)now type following command in terminalCode:# iwconfig wlan0 mode monitoringNote: If some sort of error occurs type “# iwconfig” in a terminal to check for your wireless.
(4)After that it’s time to scan for a wireless network which we will compromise with educational purpose. This time we will use the command:Code:# airodump-ng wlan0 

(5)Once you’ve found one, abort the process with Ctrl+C. Now when we have got our target it’s time to collect some information about the network. First of all copy the MAC Address of the access point which stands for BSSID (should look something like 00:15:EB:E7: …). Another thing is that we need to know the channel it’s currently working on (could see that under CH – e.g. 6). So let’s gather our information with airodump-ng.Code:# airodump-ng –w wep –c 6 –bssid 00:15:EB:E7: … wlan0 

(6)Now we need to open another terminal in which we will use ARP Reply attack to increase the amount of data packets and gather the initializing vectors or IV of the earlier chosen Access Point.Code:# aireplay-ng -3 –b 00:15:EB:E7: … wlan0 

(7)Let’s go to terminal 1 again and have a look at the data packets. We need to have collected over 20 000 packets. If so abort both airodump-ng and aireplay-ng.Now we have everything required to decode the key of the wireless network. We do that with aircrack as shown below:Code:# aircrack-ng wep-03.cap 
Then you should see that the key has been decrypted 100% successfully and the key itself.

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How to Hack Wi-Fi: Cracking WPA2-PSK Passwords Using Aircrack-Ng.

When Wi-Fi was first developed in the late 1990s, Wired Equivalent Privacy was created to give wireless communications confidentiality. WEP, as it became known, proved terribly flawed and easily cracked. You can read more about that in my beginner's guide to hacking Wi-Fi.

As a replacement, most wireless access points now use Wi-Fi Protected Access II with a pre-shared key for wireless security, known as WPA2-PSK. WPA2 uses a stronger encryption algorithm, AES, that's very difficult to crack—but not impossible. My beginner's Wi-Fi hacking guide also gives more information on this.

The weakness in the WPA2-PSK system is that the encrypted password is shared in what is known as the 4-way handshake. When a client authenticates to the access point (AP), the client and the AP go through a 4-step process to authenticate the user to the AP. If we can grab the password at that time, we can then attempt to crack it.

In this tutorial from our Wi-Fi Hacking series, we'll look at using aircrack-ngand a dictionary attack on the encrypted password after grabbing it in the 4-way handshake. If you're looking for a faster way, I suggest you also check out my article on hacking WPA2-PSK passwords using coWPAtty.

Step 1: Put Wi-Fi Adapter in Monitor Mode with Airmon-Ng

Let's start by putting our wireless adapter in monitor mode. For info on what kind of wireless adapter you should have, check out this guide. This is similar to putting a wired adapter into promiscuous mode. It allows us to see all of the wireless traffic that passes by us in the air. Let's open a terminal and type:

• airmon-ng start wlan0

Note that airmon-ng has renamed your wlan0 adapter to mon0.

Step 2: Capture Traffic with Airodump-Ng

Now that our wireless adapter is in monitor mode, we have the capability to see all the wireless traffic that passes by in the air. We can grab that traffic by simply using the airodump-ng command.

This command grabs all the traffic that your wireless adapter can see and displays critical information about it, including the BSSID (the MAC address of the AP), power, number of beacon frames, number of data frames, channel, speed, encryption (if any), and finally, the ESSID (what most of us refer to as the SSID). Let's do this by typing:

• airodump-ng mon0

Note all of the visible APs are listed in the upper part of the screen and the clients are listed in the lower part of the screen.

Step 3: Focus Airodump-Ng on One AP on One Channel

Our next step is to focus our efforts on one AP, on one channel, and capture critical data from it. We need the BSSID and channel to do this. Let's open another terminal and type:

• airodump-ng --bssid 08:86:30:74:22:76 -c 6 --write WPAcrack mon0

• 08:86:30:74:22:76 is the BSSID of the AP
• -c 6 is the channel the AP is operating on
• WPAcrack is the file you want to write to
• mon0 is the monitoring wireless adapter*

As you can see in the screenshot above, we're now focusing on capturing data from one AP with a ESSID of Belkin276 on channel 6. The Belkin276 is probably a default SSID, which are prime targets for wireless hacking as the users that leave the default ESSID usually don't spend much effort securing their AP.

Step 4: Aireplay-Ng Deauth

In order to capture the encrypted password, we need to have the client authenticate against the AP. If they're already authenticated, we can de-authenticate them (kick them off) and their system will automatically re-authenticate, whereby we can grab their encrypted password in the process. Let's open another terminal and type:

• aireplay-ng --deauth 100 -a 08:86:30:74:22:76 mon0

• 100 is the number of de-authenticate frames you want to send
• 08:86:30:74:22:76 is the BSSID of the AP
• mon0 is the monitoring wireless adapter

Step 5: Capture the Handshake

In the previous step, we bounced the user off their own AP, and now when they re-authenticate, airodump-ng will attempt to grab their password in the new 4-way handshake. Let's go back to our airodump-ng terminal and check to see whether or not we've been successful.

Notice in the top line to the far right, airodump-ng says "WPA handshake." This is the way it tells us we were successful in grabbing the encrypted password! That is the first step to success!

Step 6: Let's Aircrack-Ng That Password!

Now that we have the encrypted password in our file WPAcrack, we can run that file against aircrack-ng using a password file of our choice. Remember that this type of attack is only as good as your password file. I'll be using the default password list included with aircrack-ng on BackTrack nameddarkcOde.

We'll now attempt to crack the password by opening another terminal and typing:

• aircrack-ng WPAcrack-01.cap -w /pentest/passwords/wordlists/darkc0de

• WPAcrack-01.cap is the name of the file we wrote to in the airodump-ng command
• /pentest/passwords/wordlist/darkc0de is the absolute path to your password file

How Long Will It Take?

This process can be relatively slow and tedious. Depending upon the length of your password list, you could be waiting a few minutes to a few days. On my dual core 2.8 gig Intel processor, it's capable of testing a little over 500 passwords per second. That works out to about 1.8 million passwords per hour. Your results will vary.

When the password is found, it'll appear on your screen. Remember, the password file is critical. Try the default password file first and if it's not successful, advance to a larger, more complete password file such as one of these.

• CrackStation's Password Cracking Dictionary
• SkullSecurity's Password Dictionaries

Stay Tuned for More Wireless Hacking Guides

Keep coming back, as I promise more advanced methods of hacking wireless in future tutorials. If you haven't seen the other Wi-Fi hacking guides yet, check them out here. Particularly the one on hacking WEP using aircrack-ng and hacking WPA2-PSK passwords using coWPAtty.

And as always, if you have questions on any of this, please ask away in the comments below. 

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