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With the continuous improvement of university library network safety requirements, this paper studies encryption and decryption algorithm analyzing advanced encryption standard AES of the computer, substitution and replacement operation in encryption and decryption process, and key expansion mathematical model. The detailed design of the mathematical modeling process of the algorithm is given, and the whole mathematical modeling process is more thoroughly analyzed. According to the model, library network encryption application is completed. Verified by computer simulation technology, the mathematical model has a good robustness and achieved good results.

The Implementation of Anti-attack AES Mathematical Model in Library Network Encryption