Wheel ciphers

The Greeks developed the first encryption device, the scytale, which consisted of a wooden staff and a strip of parchment or leather. The strip was wrapped around the staff and the message was written with one letter on each wrap. When wrapped around another staff of the same size, the message appeared. In the I780 s, Thomas Jefferson invented a wheel cipher that used wooden disks with the alphabet printed around the outside. They were arranged side by side on a spindle and were turned to create a huge number of ciphers. In 1922, Jefferson s wheel cipher... 

In 1795 Thomas Jefferson created the wheel cipher using thirty-six removable and numbered alphabetic disks on a spindle. The sender and receiver must arrange the disks in the same order to communicate a message. 

A second Atbash method is cyclic rotation with the alphabet as an endless loop. This is an example of a cipher-wheel or alphabet clock. A particular output letter is found by moving either clockwise or anti-clockwise a certain number of steps from the input letter. Another numerical sequence such as six, six, six or eight, ten, twelve, fourteen is provided from other information. This indicates the... 

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