I have topic for my research paper is modified AES algorithm for enhaced security of WPA-2 , it posible ? what i should learn ?
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AES isn't a weak point of WPA2. Modifying it would almost certainly weaken it, outside trivial stuff like adding more rounds or other things consistent with the Rijndael cipher it standardizes. And even these mods can introduce insecurity if things like hardware acceleration can no longer be used and it ceases to be constant time.
More simply both AES and WPA2 are fixed, published standards. AES is used in WPA2, modified AES isn't. Once you modify AES it's no longer AES. Once you modify WPA2 it's no longer WPA2.