What code is hidden on the 3700-year old Phaistos disc? Why is the Voynich manuscript still unsolved after more than 400 years? Did the decryption of the Zimmerman telegram help end World War 1? What system was developed by GCHQ to make cipher exchange more secure and how does it work? Since we first learned to communicate, the codemaker's craft has challenged and fascinated us. For millennia, mankind has used the transmission of encrypted messages to protect privacy, share secrets, conceal truths and win wars. Highlighting the work of famous cryptanalysts, such as Alan Turing and the Colossus computer, De/Cipher offers compelling insight into the world of cryptography, revealing the cunning and ingenuity behind fifty of the greatest codes and ciphers.