  We propose a free-space reconfigurable quantum key distribution (QKD) network
to secure communication among mobile users. Depends on the trustworthiness of
the network relay, the users can implement either the highly secure
measurement-device-independent QKD, or the highly efficient decoy state BB84
QKD. Based on the same quantum infrastructure, we also propose a loss tolerant
quantum position verification scheme, which could allow the QKD users to
initiate the QKD process without relying on pre-shared key.
