"Steffo" <(E-Mail Removed)> wrote in
news:422787c6$(E-Mail Removed):
> Go with 128, some cards and routers don't even have 64 anymore:
> that means something, innit?
>
> (E-Mail Removed) wrote:
>> Just wondered how much gain in throughput I'd get by dropping to
>> WEP64 from 128.
>>
>> Just out of interest, what is the process overhead of having WEP
>> enabled i.e in simple terms, how are the packets of data
>> encrypted with WEP key. Is it a big overhead.
There should be no (or minimal) processing overhead in using WEP
encryption with a 64 or 128 bit key. The encryption is done at
hardware level in the wireless chipset. There is an overhead of 4
bytes per packet for ciphertext (encrypted) data over plaintext (non-
encrypted) data.
If you want a reasonable overview of WEP encryption have a look here:
<http://developer.intel.com/technology/itj/q22000/articles/art_5.htm>
[Aside: This article has some confused language about authentication,
although the message is there if you read carefully: WEP with Open
System authentication is more secure than Shared Key]
Note that WPA uses the same RC4 encryption algorithm as WEP, but the
way the key and message integrity are handled is different. The use
of the same encryption is because it is done at the hardware level,
and otherwise would involve a hardware change.
This hardware change will be necessary for WPA2 encryption using AES
- again, the computationally intensive encryption is done at hardware
level, and only recent wireless chipsets include the necessary
algorithms.
Hope this helps
--
Richard Perkin
To email me, change the AT in the address below
richard.perkinATmyrealbox.com
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It isn't our's either. It's ours, and likewise yours and theirs.
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