It's not clear to me from reading the wiki if TKIP encryption uses a 128 bit RC4 encryption key and a 48 bit IV, or if the 128 bit is the total, and the actual key size is 128 - 48 = 80 bit.
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Possibly, you can find your answer here networkworld.com/article/2325772/network-security/…– PandaNov 25, 2016 at 3:46