1

I'm trying to verify that storing a .dmg file stays encrypted while only the mounted file system is unencrypted (see here). My thought was to create a .dmg containing a text file, make a copy of the .dmg, then track file changes with cmp -b myvol.dmg myvol2.dmg | less - N after various actions; my hope was that the .dmg wouldn't change until I unmounted the volume, at which point it would be updated and re-encrypt the file. It looks like I was wrong, though.

Both .dmg files remain identical after mounting and opening the (identical) text files, but can be seen to differ by at least several thousand bytes after a single character change. Apparently the .dmg is diffusely (good!) updating to reflect changes in the file system, but unfortunately is a bit of a null result in my experiment.

My Question: How can I verify that unencrypted information isn't stored in the .dmg file? Is it simply enough to say that a .dmg is not directly readable, and can't be mounted without the password? I'm an encryption novice who wants to verify things directly.

Thanks!

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.