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How does Apple encrypt short messages?

The specific operation is as follows:

-Download a panda desktop software of 1 from the app Store and install it in your mobile phone as shown in the figure.

-Then open the installation software, and then enter the setting button of the software.

-Click "Advanced Features".

-Click "Apply Lock".

-Click "Open Password".

-Enter what you want.

Password twice.

-Then select the software to be encrypted in Add Locking Software, and the selected software will be displayed in the Locking Software box. So the message is encrypted.

-Then enter the password every time you read the information.

-Cancel the password, directly return to the password setting in the software, click Close Password, and the encryption will be invalid. If you want to encrypt it again, just set it again.