Grade 10 Reviews Codes and Ciphersby R.F. Churchhouse
Review by: Ian M.
New Jersey, Grade 10
What's really interesting about this book is that it gives not only simple codes and ciphers but other ways people concealed their messages. The book tells when theses secret messages were created and how to decipher them. Some are complicated and others are easy. It shows you examples of how they were used before and how they are concealed. The books also shows you how to make your own message.
I liked the book because it showed all the different ways leaders and spies used codes and ciphers. In England, scientist created these machines to help them decipher these codes during World War 1 and 2. Some spies even used invisible ink and wrote their messages on their back so they wouldn't be spotted. The most interesting one I read about was the microdots. They were these very little pieces of film that were so tiny that they could fit in a hollow coin. They could only be seen in microscopes or special micro machines. I enjoy in the book because it showed me these things I never knew about.