Not many real Confederate Army Cipher Disks survived and there are only five known to exist today. Two of these are in the hands of private collectors, one is part of the collection of the Smithsonian Institute and two are at the Museum of the Confederacy in Richmond (Virginia, USA). The Disks could be used as simple substitution cipher by setting the wheels at a known alignment, such as using setting the inner wheel letter A with the outer wheel letter D as shown in the photo of the Confederate Cipher above, but this would have been quite easy...