title: Codes and Ciphers: Julius Caesar, the Enigma, and the Internet
author: Robert Churchhouse
description: "He has written an excellent book that belongs in your personal library." Cryptologia<br /><br />"Churchhouse (emer., Cardiff Univ., Wales) offers a history and explanation of codes, ciphers, cryptography, and cryptanalysis from Julius Caesar and WWII code-breaking activities to the present day including the world of the Internet. It makes for a most exciting read... An excellent resource to support introductory courses in cryptography or crypt-analysis." Choice
zlib_text: 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  # Declan
  
  
  ### The Callaghan Mafia #1
  
  
  
  
  
  
  
  
  
  
  
  ## Savannah Rylan
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  Copyright © 2020 by Savannah Rylan
  
  
  All rights reserved.
  
  
  No part of this book may be reproduced in any form or by any electronic or
  mechanical means, including information storage and retrieval systems, without
  written permission from the author, except for the use of brief quotations in
  a book review.
  
  
  [![Created with Vellum](../Images/svgimg0003.svg) Created with
  Vellum](http://tryvellum.com/created)
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  ### Contents
  
  
  
  
  
  
  
  
  
  
  
  [Prologue](part0003.xhtml)
  
  
  
  
  
  
  
  
  1\. [Declan](part0004.xhtml)
  
  
  
  
  
  
  
  
  2\. [Declan](part0005.xhtml)
  
  
  
  
  
  
  
  
  3\. [Ciara](part0006.xhtml)
  
  
  
  
  
  
  
  
  4\. [Declan](part0007.xhtml)
  
  
  
  
  
  
  
  
  5\. [Ciara](part0008.xhtml)
  
  
  
  
  
  
  
  
  6\. [Declan](part0009.xhtml)
  
  
  
  
  
  
  
  
  7\. [Ciara](part0010.xhtml)
  
  
  
  
  
  
  
  
  8\. [Declan](part0011.xhtml)
  
  
  
  
  
  
  
  
  9\. [Ciara](part0012.xhtml)
  
  
  
  
  
  
  
  
  10\. [Declan](part0013.xhtml)
  
  
  
  
  
  
  
  
  11\. [Ciara](part0014.xhtml)
  
  
  
  
  