Wireless security (Wikipedia) describes security issues due to the fact that wi-fi deauthentication packets are unencrypted:
Weak PSK passphrases can be broken using off-line dictionary attacks by capturing the messages in the four-way exchange when the client reconnects after being deauthenticated.
Why is it not possible to protect against wlan deauthentication flooding. I understand that unencrypted managment frames are part of the standard, but why the hack is this necessary??? Especially for something as critical as a deauthentication packet? I asume there are some crytographic reasons for this, but I have no concrete idea, which is why I am asking. It would be great if anyone would know an answer.