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In this paper, we propose a centralized SDN network architecture under a smart factory for the problems under the traditional industrial IoT architecture and carry out the security analysis of industrial IoT to improve the performance of the smart factory network. Briefly describing the industrial SDN network architecture, combined with the design of a blockchain system for smart factories, the hash algorithm and asymmetric encryption algorithm are introduced to anonymize and protect the data. For traditional SDN, propose a blockchain-based SDN and analyze the probability of state transfer between SDNs. In order to solve the security problem at the SDN control level, the blockchain-based distributed SDN control model is proposed, and the PBFT consensus algorithm is introduced to realize the blockchain consensus-based multi-controller decision-making model. Add the MD5 algorithm and compare its performance with the SHA256 algorithm. Set up Adder modules with different bit widths and CSA Tree modules with different bases to calculate the encryption time of the RSA algorithm for various combinations. Set up simulation experiments to compare different malicious nodes and the average trust value of the consensus mechanism proposed in this paper for abnormal nodes in an SDN multi-controller. From the results, it can be seen that the computational speed of the RSA system is the fastest for the system implemented by Montgomery’s algorithm in base 16 and bit width 32 bits, and the time to complete the encryption process of 1024 bits once is only 0.97 ms. However, when the number of nodes is controlled in [0~5000], the rejection rate of abnormal nodes by the PBFT consensus algorithm in this paper basically maintains at about 92%. The consensus node designed and proposed in this paper is able to reject error nodes effectively and effectively secure the SDN smart factory network architecture.

With the deepening of digital development, the security protection of databases becomes more important while carrying out the digital transformation of party-building work in colleges and universities. In this study, for the database security in the party building work in colleges and universities, the protection framework of database security protection and the database hierarchical protection system based on the party building work in colleges and universities are constructed according to the needs of data hierarchical security protection. Then, on the basis of the intrusion tolerance mechanism, a database security monitoring system is established using a voting algorithm, and a multilevel information access control method is proposed for hierarchical protection. On this basis, an encryption protection mechanism based on the RSA algorithm is proposed for the sensitive information in the database of university party-building work. Through the empirical analysis of the security mechanism of counterattack protection of the university party building database, it is known that the security of the system in this paper and the probability of normal operation are both greater than 99%, and the likelihood of danger is 0.000002%. In the application of party building work, the data security of the three kinds of business is still maintained above 99.6%. The encryption time consumed is not more than 525ms, which shows that the database hierarchical protection security mechanism system constructed in this paper can meet the requirements of database security in the party building work in colleges and universities and provide a reliable guarantee for the security of the party building work database.