Being important in the field of information security, it is essential to study the major process and the mathematical models of information security risk assessment.This paper proposed amodel based on the discrete dynamic Bayesian network and further studied the major process of the assessment.The experiment which works on the implementing platform shows the results are reasonable and feasible. The model proves that it iseffective to calculate the probability of the risk.

Being important in the field of network security, it is essential to study the firewall technology that has been an indispensable part of computer networks. This paper describes a new design and implementation of ASIC firewall architecture based on the state detection technology. Implementation and measurements in a real network show that the proposed system can provide high performance with reliability, flexibility, and security.

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