An app, when you use public cloud service,it could encrypt your data, will you be interested to try it anyway?

Hey guys: When, if there is such an application (iOS, Android), you use something like dropbox, box, GD and other public cloud services, it can help you to encrypt any file, such as: personal documents, photo albums, video (perhaps very intimate); prevent your data being stolen (I think you probably do not want to let hackers broadcast your privacy), will you be interested to try it anyway?

Also, if you use a similar service, please tell me, I have to try!