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Security support is a key feature for mobile computing environments. But to construct a secure mobile environment is a daunting task because of some contradictions between the nature of mobile environment and its associated applications. This paper proposes a solution on secure data transfer among different networks using Mobile IP. The solution does not require introducing any new protocol just to modify Mobile IP with IP security primitives. It aims to modify firewalls with IP Sec processing capability. Proposed solution is named as 'Security Border Gateway' (SBG). This paper will show how Mobile IP users can securely access the proposed Security Border Gateway from anywhere with sufficient security support by encrypting and authenticating IP packets.
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