A free app for Android, by Code to Ease.
File Vault with Geo Encryption is a great app to help you keep your personal files safe from others. The best part is that it does this without compromising your personal privacy.
The application will allow you to create a secure vault that is only accessible by you. The files that you want to secure are the ones that you will be able to access only by entering the correct password.
It is important to keep in mind that the security of the app depends on the security of your device. If your phone or tablet is lost, then you will be unable to access the files that are in the vault.
