Patent ID: 6507908
Filing Date: 2003-01-14
Classification: H04L,H04W

Abstract:
A method for secure data communication with a mobile machine comprising the steps of:establishing a pool of secure addresses; receiving a data packet from the mobile machine, the data including a particular network address for the mobile machine; creating a data structure holding address translation associations wherein each association is between a particular network address and a particular one of the secure addresses; determining if the received data packet is a secure data packet; when the received data packet is a secure packet, identifying an association between the received data packet's network address and a secure address in the data structure; and translating the data packet's network address to the associated secure address before forwarding the data packet on to higher network protocol layers, wherein when the received data packet from the particular network address is not secure, passing it on without address translation to higher network protocol layers and terminating address translation for the particular network address after a preselected time interval.