Abstract:In order to solve the problem that traditional methods do not consider the inaccuracy of the evaluation results of the prevention and control measures against private information, the risk assessment method of private information security is studied by cryptography theory. On the basis of calculating the risk value with the asset-threat-vulnerability as the core, the function of security prevention and control measures is introduced to analyze. According to the relevant principles, the hierarchical risk assessment index system of private information security was established, and the weight of each evaluation index was calculated by entropy coefficient. The risk value was calculated without considering the preventive measures, and the risk value was calculated after the privacy information security was protected by cryptography theory. Combining the two, the risk value of privacy information was obtained after considering the preventive measures under cryptography theory to realize the risk assessment of privacy information security. The results show that the proposed method can effectively realize the risk assessment of private information security, and the risk assessment results of the proposed method are accurate and reasonable. It can be seen that the proposed method is accurate in evaluating performance.