Wireless World

In 4-way handshake ,PMK(Pairwise Master Key) is required for deriving PTK(Pairwise Transient Key) .PMK used as seeding material for generation of Dynamic Encryption Keys and GMK(Group Master Key) is used for deriving GTK(Group Temporal Key) which is randomly generated by Authenticator which is unique to itself.PMK is derived from MSK EAP- method in Enterprise mode  and in Personal-mode whatever PSK(Pre-shared Key) given by Supplicant is considered as seeding material which can be obtained by using some formula . PSK = PBKDF2 ( PassPhrase , SSID , SSIDLength , 4096 , 256 ) To derive 256-bit PSK

When bluetooth and wifi having common radio for transmitting and receiving data .In order to handle the switching between and wifi there will be an Intelligent Co-ex Manager in the firmware of the device to provide timeslots to each without effecting throughput of the both  .