Jefferson Disk

The Jefferson disk also know as the Jefferson wheel. This is a cipher system in which wheels or disk are used to rearrange the letters of the alphabet. Each wheel contains the 26 letters of the alphabet around its circumference. Each wheel usually has a different order of the letters around the edge. This scrambling of the letters increases the difficulty to break the cipher. There is a hole in the center of each disk that allows them all to slide onto a center axis. The cipher key is very important for the sender and receiver because it indicates the order in which the disks should be placed on the axis.