— We propose a secure data transmission scheme that takes advantage of node mobility. The scheme is based on the observation that due to mobility, messages sent at different times are routed through different intermediate nodes. The source divides a message into multiple shares and sends these shares at different times. The destination combines enough shares to recover the original message. Due to mobility, it is high unlikely that an intermediate node is able to collect enough shares. The feasibility of this scheme is analyzed and simulated.