CHAPTER 4
POLYALPHABETIC SUBSTITUTION
THIS CHAPTER describes the cryptanalysis of polyalphabetic encipherment. The use of coincidence to determine the period and correlation to identify the key to cryptanalyze Vernam–Vigenère ciphertext will be explained. The one-time pad and the greater triumph of cryptanalysis against the Soviet KGB will be discussed. Problems to test your skills follows the text.
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