How can an MP3 player be encrypted?

Question

A lot of the $10 mp3 players from China do a lot of what modern computing is (they read pdfs, play music, etc. I haven't seen one that saves text files but that doesn't seem a stretch to add). But they don't come with boot/lock screen encryption. How can this be added? (asking in a computer programming way, like How can this be approached from the coding level.)Could mp3 players become little computers (I understand they are computers) that do a lot of what we do with a computer?

PaulHoule · Accepted Answer

Doesn&rsquo;t an MP3 player have some kind of operating system? You need filesystem drivers at the very least. You could certainly make one with Linux and if you did you could encrypt at the block level below the file system.