Cryptology, 2nd Edition

Hints and Answers for Selected Exercises

2.1.3    Exercises

1.  

(a) VZUWS WSD AXGDR RDGDAOUAD

4.  

(a) G TDRNN DOUR TOUR

7.  

(a) DMKIZAMN GWREK WG AYARC UWKN

2.2.1    Exercises

1.  

(a) The two most common letters in the ciphertext correspond to the two most common letters in ordinary English.

(b) The two most common letters in the ciphertext correspond to the two most common letters in ordinary English.

(c) The most common letter in the ciphertext corresponds to the plaintext letter A.

2.  

(a) The first word in the plaintext is THE, and there are three keywords, the second of which is NEW.

(b) The second most common letter in the ciphertext corresponds to the plaintext letter N, and the third and fourth most common letters in the ciphertext ...