When you rearrange your text in a "wave" sort of pattern (down, down, up,
up, down, down, etc.), it is called a railfence. Take the text "WAFFLES FOR
BREAKFAST" and arrange them in waves like the diagram below. I substituted
* for spaces just to illustrate that the spaces are not removed.
W L F B K T
A F E * O * R A F S
F S R E A
You leave the spaces in. Next, you squish together the lines,
remembering to keep the spaces in. I did not replace spaces with stars
since the spaces are clearly shown in the middle line.
AFE O RAFS
Then you just combine the lines and get WLFBKTAFE O RAFSFSREA.
There is another site with more
of a description and another encoder.
This is your encoded or decoded text. It may be hard to see spaces
at the beginning, end, or two in a row.
Be careful when copying encrypted text and make sure that it will
decrypt to the message properly.