Patent ID: 8428554

Claim:
A method involving a femtocell in communication with a secure network, comprising: authenticating, at a first secure entity in the secure network, a mobile unit using a global authentication response received from the mobile unit, wherein the global authentication response is generated by the mobile unit using a first security key and a first random number , wherein the first security key is unknown to the femtocell; receiving, at the first secure entity and from a second secure entity in the secure network, at least one second security key formed based on the global challenge; transmitting a unique challenge comprising a second random number from the first secure entity to the mobile unit via the femtocell; receiving, at the first secure entity and from the femtocell, a unique challenge response generated by the mobile unit using the second random number and the first security key; and providing said at least one second security key to the femtocell in response to the first secure entity authenticating the mobile unit based on the second random number.