November 2018
Beginner
424 pages
11h 43m
English

Cryptography is the science of secure communication through the use of codes and ciphers. A code replaces whole words with other words; a cipher scrambles or replaces the letters in words (so technically, Morse code is really Morse cipher). One goal of cryptography is to use a key to both encrypt readable plaintext into unreadable ciphertext and then decrypt it back to plaintext. The goal of cryptanalysis is to decode ciphers and codes without knowing their key or encryption algorithm.
In this chapter, we’ll investigate two ciphers used in the American Civil War: the route cipher, used by the North, and the ...