wep crack using spoonwep

1)  Make sure that ur Wifi card is in Monitor Mode
if u dont how to do this see below
wlanconfig ath0 create wlandev wifi0 wlanmode monitor
2) airodump-ng ath0
3) Choose the AccessPoint(AP) u want to Decrypt WEP and Remember the Channel
4) Then copy the AP MAC address
5) Then Run SpoonWEP tool
6)In Victim MAC Paste the AP MAC Address.
7)Choose ur Network Card & my Interface is ATH0
8)Set the AP Channel Number
9) Set the Injection rate to maxium
10)Use  Fragmentation and Forge Attack
11)Use 128 Bits key Length
12)Click launch wait for few Minutes u have Decrypted 128 Bit WEP key