In Internet, the public department information system is confronted with increasingly severe threats. In order to protect the public department information security and seize the "Information Superiority", great emphasize must be laid on the information security assurance. The key point of solving the problem of public department information security is constructing the architecture of information security assurance (AISA). A framework of the AISA in internet is proposed, and the function of each module is described respectively, which provides a useful reference to the construction of the AISA.
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