Slightly off topic… data stored in the android app is not secure. So even if you have password protection on the actual app, a thief would still be able to see individual notes on the SD card.
I use a seperate encryption app called ‘droid crypt’. You can encrypt the entire evernote folder on the SD card. I’m not sure if there’s a way of automatically encrypting the SD card once you exist the evernote app. So I’ve been manually encrypting each time I make a change.