The authors At the home of the Beale Ciphers, where we had the idea to write this book We spent hundreds of hours Skypeing between the US and Germany. From the book “Codebreaking: A Practical Guide” teaches you how to crack encryptions of all kind. An encrypted telegram from 1939. Chapter 2 in our book explaines how it can be deciphered. An encrypted postcard from 1909. Chapter 3 of our book shows how it can be broken. An anonymous letter, written in the style of the Zodiac Killer. With methods described in Chapter 4, it can be read. The unsolved ciphertexts left behind by wife murderer Henry Debosnys are covered in Chapter 6. This birthday card encrypted with a turning grille can be solved with methods described in Chapter 11. The encrypted text on this Kryptos maquette was solved with techniques explained in Chapter 8. An encrypted booklet; it was deciphered by Klaus’s blog readers. See chapter 13. The cryptogram left behind by the famous Somerton Man. It is unsolved, as can be read in Chapter 13. The fourth part of the message on the Kryptos sculpture is still unsolved (Appendix A).