Join the Cryptokids as they apply basic mathematics to make and break secret codes. This book has many hands-on activities that have been tested in both classrooms and informal settings. Classic coding methods are discussed, such as Caesar, substitution, Vigenère, and multiplicative ciphers as well as the modern RSA. Math topics covered include: - Addition and Subtraction with, negative numbers, decimals, and percentages - Factorization - Modular Arithmetic - Exponentiation - Prime Numbers - Frequency Analysis The accompanying workbook provides students with problems related to each section to help them master the concepts introduced throughout the book. A PDF version is available at no charge. Download Now A printed workbook is available for $14.00. Click Here for more information and to order. The teacher manual can be requested from the publisher by contacting .

Janet Beissinger is a coauthor of the K-5 mathematics curriculum Math Trailblazers. She received a Ph.D. in mathematics in 1981 from the University of Pennsylvania. Her research has been in combinatorics and in mathematics education, and she has 20 years experience in teacher training and curriculum design. She is a professor at the Institute for Mathematics and Science Education at the University of Illinois at Chicago.Vera Pless is the author of Introduction to the Theory of Error-correcting Codes, a coauthor of Fundamentals of Error-correcting Codes, and has published over 100 papers. She received her Ph.D. from Northwestern University in 1957. Since 1975 she has been a professor in the Mathematics Department at the University of Illinois at Chicago.