Data Safe app
My new application Data Safe is now available for free download on Firefox Marketplace
This app allows one to choose files from phone and encrypt them with a pass phrase. One can even decrypt the encrypted file.
Note that the app does not encrypt the actual file, but a copy of it, so you would not lose the original. One can encrypt any file like documents, music, videos, pictures, etc.
This app have more than 15k+ downloads
You can download the app from: https://marketplace.firefox.com/app/data-safe/
Article related to the app was featured in newspaper “Maharashtra Times”