The art of secret message transmission was valued in ancient times and is still being perfected today. How did people in different eras convey their secrets? How can one encrypt their message now so that it cannot be read by...
outsiders? The answers are provided by the science of cryptography and this book, which tells about the art of secret writing. For older preschool and younger school-age children. 4th edition.
The art of secret message transmission was valued in ancient times and is still being perfected today. How did people in different eras convey their secrets? How can one encrypt their message now so that it cannot be read by outsiders? The answers are provided by the science of cryptography and this book, which tells about the art of secret writing. For older preschool and younger school-age children. 4th edition.
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