從這本書中你可以了解到高機密傳訊密碼到底是怎麼一回事及相關的一切,可以算是一本小小百科全書。適合9歲以上兒童閱讀或是圖書館收藏。 With this book of crafty codes, you can discover ways of sending top secret messages that will leave snoopers completely baffled. Many of the codes are based on those used by real spies. There are nifty gadgets to make and lots of hints on how to keep your enemy stumped. As you learn new codes, you can follow a thrilling story involving undercover agents and secret code experts. |