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Protecting sensitive information systems from security threats such as unauthorised access, information eavesdropping and information interfering, is significant. Most of the natural approaches employ strong authentication and/or cryptography systems to protect critical data. But those approaches do not stress on the potential amount of risks associated with sensitive information, especially the vulnerability of long term cryptographic keys. Therefore, in this paper, a secure sensitive information system is proposed and implemented based on a dynamic key generation technique. It associates with elliptic curve key exchange protocol as a design solution for wireless mobile devices to achieve critical information data security and network security.