I need to download and save any type of media file (i.e .mp3, .mp4 etc) in an external storage which cannot be read from any other application other than my own. Encryption and Decryption is really slow, it takes 23-27 seconds to encrypt a file of 6MB and decryption takes almost the same time and waiting 23 seconds to start listening a downloaded song is not good. So I had a thought that creating your own VFS (Virtual File System) with CRUD methods might do the trick, so any guidelines to how to implement a VFS or any other solution which will improve the processing time, will be really helpful.
Thanks.