AES, TKIP, and WEP

[wlanstudent]

Could some one help me on these questions?



Packet Integrity WEP= CRC32/MIC TKIP=? AES=?

Encryption Algorithm WEP=RC4, WEP=RC4, WEP=?


I am guessing that TKIP still uses RC4, but the rest I am not sure about.

Thanks

[JoeTampa]

Not sure what you mean by those "x=y" items. Please rephrase your examples.


TKIP does not "use" anything; a given product may combine TKIP (the protocol) with any given encryption algorithm (like RC4 or AES).

If you are referring to the efforts of the IEEE 802.11i task group, their solution revolves around TKIP/AES/MIC.

[wlanstudent]

Thanks for your response, as before your insights have really helped - thanks.

I studied TKIP as see now what it is.

Another question, was AES method ever finalized - OCB vs CBC MAC (CCM) method for 802.11i?

[JoeTampa]

That I don't know, to be honest.

[PuLSe]

AES is not a streamed cipher, it is a block cipher. Like DES, in fact, it replaces DES as the block cipher for 802.11i.

To be used as a stream cipher the block cipher needs something like RC4. I am not sure what is used in 802.11i

TKIP is a 'fix' for WEP and is not a part of 802.11i (I dont think) although it will continue to be used in legacy 802.11b products.

Check here for more on AES:
http://csrc.nist.gov/CryptoToolkit/aes/aesfact.html

Hope it helps