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In the rail fence cipher, the plaintext is written downwards diagonally on successive "rails" of an imaginary fence, then moving up when the bottom rail is reached, down again when the top rail is reached, and so on until the whole plaintext is written out. The ciphertext is then read off in rows.
The rail fence cipher follows a pattern similar to that of the scytale, (pronounced "SKIT-uhl-ee") a mechanical system of producing a transposition cipher used by the ancient Greeks. The system consisted of a cylinder and a ribbon that was wrapped around the cylinder. The message to be encrypted was written on the coiled ribbon.
The rails are stacked on top of one another. Most split rail fences have the rails stacked in an interlocking zig-zag fashion that is self-supporting, easy to create, easy to repair, and easy to disassemble. Some timber fences have the rails stacked directly on top of each other and secured with double fence posts (one on either side of the rails).
A horizontal top rail and bottom rail are attached to fence posts, which are installed upright into the ground. Evenly spaced boards are affixed vertically to the rails. These boards with pointed tops are called "pickets" for their resemblance to the pointed stakes historically used by infantry to repel cavalry.
Riding the rail (also called being "run out of town on a rail") was a punishment most prevalent in the United States in the 18th and 19th centuries in which an offender was made to straddle a fence rail held on the shoulders of two or more bearers. The subject was then paraded around town or taken to the city limits and dumped by the roadside.
Deer and many goats can easily jump an ordinary agricultural fence, and so special fencing is needed for farming goats or deer, or to keep wild deer out of farmland and gardens. Deer fence is often made of lightweight woven wire netting nearly 2 metres (6 feet 7 inches) high on lightweight posts, otherwise made like an ordinary woven wire fence.
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