In Mac OS X 10.5 (Leopard) you will also be able to select 256-bit AES encryption, which is slower but more secure than 128-bit. Select a predefined size or select 'Custom' and enter your own size. Follow these steps to create your own encrypted disk image. Disk images are very common on Macs, especially when distributing software, but they can also be used as a container to store sensitive data.
Once mounted, they appear like a USB key or other external drive would. dmg file extension and are 'mountable' by double-clicking on them. Instructions For Setting Up An Encrypted Disk ImageĪ disk image is a file on your Mac?s hard drive that acts like a disk that you can read/write to.
