Prior to getting hold of a Raspberry Pi, I'd never used SD cards for anything, but I'm now finding them extremely handy for carrying large amounts of data with me when I travel to job sites. Since these may sometimes contain confidential data, it would be nice to take advantage of the SD cards' inherent security feature, i.e., the password protection feature. Unfortunately I have yet to see any SD card reader or computer system software that implements this feature. I did find one PC based utility (but my main computer is a Mac) that will lock or unlock an SD card, but I'm rather leery of any product coming from a company called Kakasoft, and which uses terribly broken English on its website.
So, my question is: Does anyone know of an SD reader that makes use of the password feature?
Failing this, I was thinking it might be an interesting project to build a small microcontroller based interface that goes between a standard SD reader and the SD card, allowing the user to enter a password by means of a small built-in keyboard. Any thoughts?