Encryption is enabled by the exchange of at least one key and the generation of additional keys by {HEAD ~ the access point} and {TAIL ~ the mobile computing unit} to make the communications secure 
Encryption is enabled by the exchange of at least one key and the generation of additional keys by { HEAD ~ the access point } and { TAIL ~ the mobile computing unit } to make the communications secure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH