https://www.penguinrandomhouse.com/books/168002/the-code-book-by-simon-singh/
The Code Book by Simon Singh: 9780385495325 | PenguinRandomHouse.com: Books
In his first book since the bestselling Fermat's Enigma, Simon Singh offers the first sweeping history of encryption, tracing its evolution and revealing...
the codeby simonbooksinghpenguinrandomhouse