This is the same advantage possessed by a zig-zag split rail fence. Here is another example to see how to actually solve a Rail Fence cipher. Route ciphers have many more keys than a rail fence. This solution does not work on all Rail Fence Ciphers. Calvin discovers a diary in the library, encrypted with a rail fence cipher. A white rail fence surrounds the cemetery. A timber safety rail fence surrounds the memorial precinct. The term zigzag cipher may refer to the rail fence cipher as described above. Porter's remaining forces yielded ground and joined the others behind the rail fence. It is bisected by a post and rail fence so it watered two paddocks. The rail fence cipher (also called a zigzag cipher) is a form of transposition cipher. Robertson ordered the men to throw down a rail fence that obstructed their path. To both street frontages is a timber picket and rail fence with brick corner posts. There is park rail fence on both sides of the bridge. Modern steel star pickets and wire strands have replaced the original post and rail fence.