An Ottendorf Code is a series of numbers that point to pages, lines, and words in a book. Unless you know which book is the "key," this simple ciphering system can be hard to break. But if you know the book that is being used as the key, deciphering a secret message becomes very simple.

For instance, an Ottendorf Code may look like this (THIS IS AN EXAMPLE ONLY!):

34

19

7

14

61

8

16

23

78

99

1

15

In these three columns, the lines are read from left to right to discover each word in the cipher. Above, note that the first line has the numbers 34, 19, and 7. This means, using whatever book is designated as the "key", the first word in the cipher will be found in that book on page 34, line 19, and is the 7th word in that line. After locating this word, you move to the next line in the code and go to page 14, line 61, and count over to the 8th word and so on. This continues until you reach the final line in any such code and presto, you have the secret message!