Books with title Codes and secret writing.

"A fascinating, challenging book." ― A.L.A. BooklistLearn to use the most important codes and methods of secret communication in use since ancient times. Cipher and decipher codes used by spies. Explore the famous codes that changed the fate of nations and political leaders. And enjoy hours of fun experimenting with cryptography ― the science of secret writing. Beginning with simple letter substitutions and transposition ciphers, world-famous science writer Martin Gardner explains how to break complicated polyalphabetical ciphers and codes worked with grids, squares, triangles, and charts. You'll learn codes that are keyed to typewriters and telephone dials . . . even codes that use playing cards, knots, and swizzle sticks. Experiment with invisible writing ― inks that glow in black light and turn red under heat ― and explore the possibilities of sending messages through outer space to unknown worlds. Using this book, you can solve the historically famous Playfair Cipher used by Australia in World War II, the Pigpen Cipher used by Confederate soldiers during the Civil War, Thomas Jefferson's Wheel Cipher, the Beaufort system used by the British Royal Navy, codes devised by authors for heroes in literature ― Sherlock Holmes, Captain Kidd, and the Shadow. And you will enjoy experimenting with bizarre methods of message sending ― the Dot Code, Knot Code, Swizzle Code, and more. Young cryptanalysts, cipher fans, and puzzlists of all ages will find hours of intrigue and challenge in Codes, Ciphers and Secret Writing. "A stimulating must for the intermediate cryptographer." ― The Kirkus Reviews

"A fascinating, challenging book." ― A.L.A. BooklistLearn to use the most important codes and methods of secret communication in use since ancient times. Cipher and decipher codes used by spies. Explore the famous codes that changed the fate of nations and political leaders. And enjoy hours of fun experimenting with cryptography ― the science of secret writing. Beginning with simple letter substitutions and transposition ciphers, world-famous science writer Martin Gardner explains how to break complicated polyalphabetical ciphers and codes worked with grids, squares, triangles, and charts. You'll learn codes that are keyed to typewriters and telephone dials . . . even codes that use playing cards, knots, and swizzle sticks. Experiment with invisible writing ― inks that glow in black light and turn red under heat ― and explore the possibilities of sending messages through outer space to unknown worlds. Using this book, you can solve the historically famous Playfair Cipher used by Australia in World War II, the Pigpen Cipher used by Confederate soldiers during the Civil War, Thomas Jefferson's Wheel Cipher, the Beaufort system used by the British Royal Navy, codes devised by authors for heroes in literature ― Sherlock Holmes, Captain Kidd, and the Shadow. And you will enjoy experimenting with bizarre methods of message sending ― the Dot Code, Knot Code, Swizzle Code, and more. Young cryptanalysts, cipher fans, and puzzlists of all ages will find hours of intrigue and challenge in Codes, Ciphers and Secret Writing. "A stimulating must for the intermediate cryptographer." ― The Kirkus Reviews

Secret Word Puzzle BookDo your kids love solving puzzles and earning fun rewards through learning?Want to send your children on a journey that’s both exciting and educational?Get ready for an incredibly fun and exciting learning adventure with our puzzle-solving book for kids! This Secret Word Puzzle Book is a puzzle-solving book that contains 23 unique and thrilling puzzles that helps teach your child necessary spelling as well as symbol coding, an essential skill that used for IQ testing in young children.With each puzzle your kids solve in our kids’ puzzle-solving book, they receive coordinates that lead them around our book’s map, guiding them towards the buried treasure. Every time they solve a puzzle, they’re not only getting one step closer to their prize, but they’re also training themselves on how to spell words correctly.Once your little one reaches the end of our kid’s puzzle book and puts all of their coordinates together, they’ll find their prize of a free e-book download. This e-book provides them with more thrilling learning opportunities just like this puzzle book for kids!Need more reasons to choose our Secret Word Puzzle Book! This treasure puzzle book is perfect for kids ages 4-9 to learn how to write and spell basic words and understand digit symbol coding The prize at the end of our puzzle-solving book for kids helps keep them engaged through all 23 puzzles The contents of our kids’ puzzle book are presented in full-colour, adding to the excitement Our kids’ puzzle-solving book makes a great birthday or back to school gift for young children Get your kids excited to learn with a real piece of treasure at the end with our Puzzle Book for Kids!

Secret Word Puzzle BookDo your kids love solving puzzles and earning fun rewards through learning?Want to send your children on a detective story that is both exciting and educational?Get ready for an incredibly fun and exciting learning adventure with our puzzle-solving book for kids! This Secret Word Puzzle Book is a puzzle-solving book that contains 23 unique and thrilling puzzles that helps teach your child necessary spelling as well as symbol coding, an essential skill that used for IQ testing in young children.With each puzzle your kids solve in our kids’ puzzle-solving book, they receive coordinates that lead them around our map, guiding Yates to solve a crime. Every time they solve a puzzle, they’re not only getting one step closer to an amazing free gift, but they’re also training themselves on how to spell words correctly.Once your little one reaches the end of our kid’s puzzle book and puts all of their coordinates together, they’ll find their prize of a free e-book download. This e-book provides them with more thrilling learning opportunities just like this puzzle book for kids!Need more reasons to choose our Secret Word Puzzle Book! This treasure puzzle book is perfect for kids ages 6-9 to learn how to write and spell basic words and understand digit symbol coding The prize at the end of our puzzle-solving book for kids helps keep them engaged through all 23 puzzles The contents of our kids’ puzzle book are presented in full-colour, adding to the excitement Our kids’ puzzle-solving book makes a great birthday or back to school gift for young children Get your kids excited to learn with a real piece of treasure at the end with our Puzzle Book for Kids!