Concepts in Data Encryption:
In the example above the message was written out and the grille card was punched out as needed to create the secret message. Since the message was fairly long it was easy to get all the necessary characters to create the secret message "Is it not human to err." However, the encipherer now needs to create a second grille card for the recipient and must get both the grille card and the secret message to the recipient using separate means. Otherwise an interception could easily mean the message is successfuly deciphered.
A better, but more complicated method, for creating a grille method is to make up a set of master grille cards that have hole punches in the same location on each card. Then the message is written in so that the letters for the secret message land in the grille punched locations.
Copyright ©1999 ThinkQuest Team 27158 Developed for ThinkQuest 1999