Why is the WPA2-PSK key length limited to 63 characters?
The PSK is derived from the passphrase using PBKDF2 key derivation function with SHA1 as the pseudo random function. The passphrase is an 8-63 character ASCII encoded string. PSK = PBKDF2(PassPhrase, ssid, ssidLength, 4096, 256) The PSK is 32 bytes (256 bits), often displayed as 64 hex characters. According to the 802.11i specification: A pass-phrase … Read more