Exercise 1.1

Problem

Decrypt the ciphertext provided at the end of the section on monoalphabetic substitution ciphers.

Solution

abcdefghijklmnopqrstuvwxyz => hcjkfeyvbuxzplomtgwqiasdrn

Plaintext:

CRYPTOGRAPHICSYSTEMSAREEXTREMELYDIFFICULTTOBUILDNEVERTHELESSF
ORSOMEREASONMANYNONEXPERTSINSISTONDESIGNINGNEWENCRYPTIONSCHEM
ESTHATSEEMTOTHEMTOBEMORESECURETHANANYOTHERSCHEMEONEARTHTHEUNF
ORTUNATETRUTHHOWEVERISTHATSUCHSCHEMESAREUSUALLYTRIVIALTOBREAK