Scytail

A simple cipher that uses a "rail offset" to produce a plaintext cipher
the ciphered text is then put into blocks to hide the original plain text word breaks.

Example:
Text: NICE DAY FOR A WALK

Rails 3:
N - - E - - Y - - R - - A - -
- I - - D - - F - - A - - L -
- - C - - A - - O - - W - - K

Result: NEYR AIDF ALCA OWK

Rails:	Blocks: