A free app for Android, by Tips Box.
Encrypt Decrypt File is a simple and useful tool that allows you to encrypt your files and folders with AES algorithms. It supports external SD cards, and you can use it to encrypt files downloaded from the internet.
This tool is designed to work with external SD cards and can be used to encrypt files that are stored in the device's internal storage. The SD card is an internal storage card that is used in many mobile devices.
This tool will also allow you to create a secure password and will let you know what the password is for. It's also possible to copy the secure key to the clipboard.