Patent ID: 8131672

Claim:
A secure data record synchronization system, comprising: a host system coupled to a host database, wherein the host database stores data records that include a first host-synchronization-parameter and a first device-synchronization-parameter; the host system being configured to generate a first update message that is encrypted and transmitted over a network to a portable data communication device when a first data record is updated at the host system, the first update message including the first host-synchronization-parameter, the first device-synchronization-parameter, and the updated first data record; wherein the portable data communication device includes a device database that stores data records that include a second host-synchronization-parameter and a second device-synchronization-parameter; the host system being further configured to receive from the portable data communication device a second update message, the second update message being generated and encrypted by the portable data communication device and being transmitted to the host system when a second data record is updated at the portable data communication device, the second update message including the second host-synchronization-parameter, the second device-synchronization-parameter, and the updated second data record.