The availability of a communication channel that could be everywhere accessible, possibly via wireless devices is a constant matter for the police force. The well-developed public cellular network infrastructure and widespread mobile device can provide with such features, but the lack of security makes it unsuitable for transmitting confidential data. In this paper, we propose a security framework for mobile police information system to transmit sensitive information confidentially over the public cellular network, and describe the authentication and communication protocol in detail. The test on a physical GSM based cellular network reveals that it is suitable for actual needs both in speed and security.
To ensure the security of the top-level design of the security gateway, we proposed a method of formally designing and verifying a typical security gateway. Firstly, we designed the typical security gateway's security policy according to its security requirements. Secondly, we formally modeled the security policy and verified the security model's internal consistency by means of BLP model. In the end, we verified the consistency between the security gateway's functional specifications and its security model. To make sure the reasoning procedure's correctness, we used the theorem prover Isabelle/HOL to formally describe the above work and help us deduce. Our work ensures the security of a typical security gateway in terms of top-level design and exerts certain referential significance on formal design of security gateway.
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