Wi fi


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Wi fi

  1. 1. By Rohit Shaw Page 1 Wi-Fi : "WiFi" is the short form for Wireless Fidelity. It is a high speed internet and network connection without the use of wires, cables. It means a type of wireless networking protocol that allows devices to communicate and transfer data wirelessly without cords or cables.[1] Wi-Fi is technically an industry term that represents a type of wireless local area network (LAN) protocol based on the 802.11 IEEE network standard. It's the most popular means of communicating data wirelessly, within a fixed location, today.[2] A device that can use Wi-Fi (such as a personal computer, video game console, smartphone, tablet, or digital audio player) can connect to a network resource such as the Internet via a wireless network access point. Such an access point has a range of about 20 meters (65 feet) indoors and a greater range outdoors.[3] Wi-Fi KEYS : A wireless key is an encryption setting commonly used on wireless computer networks to increase their security. The two standard types of wireless keys support WEP and WPA encryption. To use a wireless key on a home network, administrators first set up an encryption method on the router (either WEP or WPA) and choose a value for the appropriate key. Then, the administrator Wi-Fi Wi-Fi Keys • WEP • WPA TUTORIAL CONCLUSION
  2. 2. By Rohit Shaw Page 2 sets the same value on each wireless device connecting to the router. Wireless keys are hexadecimal numbers that vary in length (but are typically between 128 and 256 bits long) depending on the encryption method used.[4]  WEP : WEP stands for Wired Equivalent Privacy, A WEP key is a security code used on some Wi-Fi networks. WEP keys allow a group of devices on a local network (such as a home network) to exchange encoded messages with each other while hiding the contents of the messages from easy viewing by outsiders. A WEP key is a sequence of hexadecimal digits. These digits include the numbers 0-9 and the letters A-F. The length of a WEP key depends on the type of WEP security utilized: i) 40-/64bit WEP: 10 digit key ii) 104-/128bit WEP: 26 digit key iii) 256bit WEP: 26 digit key[5]  WPA : WPA was developed by the networking industry in response to the weaknesses of WEP. WPA provides stronger encryption than WEP through use of either of two standard technologies: Temporal Key Integrity Protocol (TKIP) and Advanced Encryption Standard (AES). A variation of WPA designed for use on home networks is called WPA Pre Shared Key or WPA- PSK for short. WPA-PSK is a simplified but still powerful form of WPA.[6] TUTORIAL : In this tutorial here I am going to show you how to crack WEP keys in Windows platform. Tools required : 1] CommView for WiFi 2] Aircrack-ng Now open your CommView for Wifi and go to file option and click on file capture like shown in figure.1
  3. 3. By Rohit Shaw Page 3 Figure.1 After that a new window appears and then click on start scanning. Figure.2
  4. 4. By Rohit Shaw Page 4 After scanning its shows the list of all channels and the wireless networks which is running on specified channels like shown in figure.3 Figure.3 In above figure.2 I selected a network which is running on channel 6.For details see in right side of window it shows the network encryption type, SSID, MAC address. Then click on capture and wait for the packet data you have to create minimum 5000 packets for cracking a WEP key. Numbers of packets are high then it is easy for you to crack the key. Like shown in figure.4
  5. 5. By Rohit Shaw Page 5 Figure.4 When sufficient packets will create the go to file options and click on stop capture. Figure.5 After the capturing process it creates a log file in log folder you can check your log folder directory by clicking on log tab. In figure. 6 here it shows the directory of my log folder which is in my documents/CommView for Wifi/Logs.
  6. 6. By Rohit Shaw Page 6 Figure.6 Now go to log folder there you can see a capture file like shown in figure.7 Figure.7 Now just double click on that file and a new window appeared then go to file option select Export logs then select Wireshark/Tcpdump format and save your file. Here I save my file name as hack.cap in my desktop shown in figure.8
  7. 7. By Rohit Shaw Page 7 Figure.8 Now open your Aircrack GUI and browse for your saved capture file. Shown in figure.9 Figure.9 After that click on Launch button then a cmd window appears and asking for index no. of target network here my target network index no. is 1 like shown in figure.10
  8. 8. By Rohit Shaw Page 8 Figure.9 After putting your index number then press enter and the cracking process starts and the key decrypted successfully like shown in figure.11 Figure.10
  9. 9. By Rohit Shaw Page 9 CONCLUSIONS : Hence we conclude that WEP key is not secured. If we create a 256 bit key that can also cracked but that is time consuming we have to capture a higher number of packets and data. REFERENCES : 1] URL - http://www.squidoo.com/what-is-wifi 2] URL - http://mobileoffice.about.com/od/glossary/g/wi-fi.htm 3] URL - http://en.wikipedia.org/wiki/Wi-Fi 4] URL -http://compnetworking.about.com/od/wirelesssecurity/f/what-is-a- wireless-key.htm 5] URL - http://compnetworking.about.com/od/wirelessfaqs/f/wep_keys.htm 6] URL - http://compnetworking.about.com/cs/wirelesssecurity/g/bldef_wpa.htm