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wep key change length


smudge11's Avatar
smudge11 smudge11 is offline
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11-Jun-2007, 02:18 PM #1
wep key change length
I'm fairly new to computers and need to change the length of the wep key code in vista. It wants 5 or 13 character code my modem wants a 10 character code (no option available here). Is there a way to change the wep code length in vista? I really don't want to go unsecured wireless.

Thanks for the help.

gurutech's Avatar
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11-Jun-2007, 02:23 PM #2
If you can go with WPA or WPA2, that would be better than WEP.
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Flint87 Flint87 is offline
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11-Jul-2007, 05:00 PM #3
There are two numbering systems here (as well as two versions of WEP).

WEP uses either 64 bits or 128 bits for the key. The first 24 bits of the key are the initialization vector (IV). Subtract out the 24 bits of the IV to get the entered key.

64 24 40 bits; 40 bits / 8 bits per character = 5 ASCII characters
128 24 104 bits; 104 bits / 8 bits per character = 13 ASCII characters

With me so far?

The math for the hexadecimal numbering system is based on 4 bits (0 to F; 0 = 0000, F = 1111)

64 24 = 40 bits; 40 bits / 4 bits = 10 hex digits
128 24 = 104 bits; 104 bits / 4 bits = 26 hex digits

So you can enter 5 ASCII characters or 10 hex characters to yield the same key for 64-bit WEP. Hex numbers are typically preceded by a 0x.

I hope this helps.
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