Perfect Square Cipher

JULIUS CAESAR'S PERFECT SQUARE CIPHER

Caesar was the first code-writer in history. When his foot-messengers started getting ambushed and his secret communiques stolen, he devised a rudimentary way to encrypt his directives. He rearranged the text of his messages such that the correspondence looked senseless. Of-course it was not. Each message had a letter count that was a perfect square-sixteen, twenty-five, one-hundred-depending on how much Caesar needed to say. He secretly informed his officers that when a random message arrived, they should transcribe the text into a square grid. If they did and read top-to-bottom, a secret message would appear.