could not use 128 bit

[tuan-nguyen]

hi all,

i've a problem with my Aironet adapter 350. My problem is that i could not use the 128 bit for it.

i just can choose 2 value 40 bit and 104 but not 128bit.

my laptop uses window xp.

[dixho]

104-bit is equivalent to 128-bit. Inside 802.11 frames, there is a field call IV (initialization vector). The length of IV is 24bit. AP or client concatenates IV and the WEP key and use that to encrypt and decrypt data. This gives more randomness for the encryption key. As a result, 40-bit encryption is equivalent to 60-bit (40-bit wep key + 24-bit IV) and 104-bit encryption is equivalent to 128-bit (104-bit wep key + 24-bit IV).