使用它，您可以将会话信息存储在数据库中，或者实现一个用于加密和解密你的所有数据的处理器。
With it, you can store session information in a database or implement a handler for encrypting and decrypting all of your data.
密钥用于数字签署文档和验证签名，也用于加密和解密过程。
Keys are used for digitally signing documents and verifying signatures, and they help with the encryption and decryption processes.
它为您提供了图形用户界面，用于加密和解密您的敏感数据。
It provides you with a user-friendly graphical interface for encrypting and decrypting your sensitive data.
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