There are many methods for data encryption at present, which play a certain role in data protection. However, if a fixed key is used or the key is transmitted together with the data, it cannot achieve a satisfactory confidentiality effect. In the process of practice, I have explored a set of random key methods in the \"request-response\" mode, which has a very satisfactory effect on the confidentiality of passwords and data. When the client program starts and attempts to establish a connection with the server program, the client program obtains a random string generated by the server program from the server side. The system will use this string as the key to transmit the user\'s login password and data. Since the key is randomly generated by the server program, the key is different each time the client logs in, which greatly reduces the possibility of data theft due to password interception.
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