A History of Cryptography - Introduction to Cryptography with Java Applets - page 12

TABLE 1.9

Distance between
(i-1)th and ith
occurrence

i

2 56

3 14

4 35

5 63

6 9

7 5

8 28

9 35

10 33

11 21

12 35

TABLE 1.10

Occurrence Distance

2 15

3 15

4 15

5 10

6 10

with, since E is more likely to appear than any other letter in plaintext. However, we have
even more information: The most common triple in English is THE, and in this example it
probably corresponds with the triple LJV. Even with this short amount of text, we can try a
few possibilities. The one that works is shown in Table 1.12.
Thus, we derive the keyword

SCRAM