If you mount an encrypted disk image, the entire image is decrypted?

I keep sensitive files on an encrypted disk image.  If I mount the disk image is any image decrypted or does OS X that decrypt the files that you open, on the fly?  I ask because I'm afraid that a hacker could access my computer remotely and poking it in the disk image if all is decrypted when it is mounted.  Any thoughts?

Mounted image files will be available in a form that is decrypted until it tore.

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Tags: Mac OS & System Software

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