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Blue Vase Books
Break the Code: Cryptography for Beginners (Dover Kids Activity Books)
Break the Code: Cryptography for Beginners (Dover Kids Activity Books)
Author: Johnson, Bud
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$5.75
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$5.75
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Condition: Good
paperback
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No, it's not a message from outer space! Just read it backwards, starting from the bottom line, to discover what this specially coded message says. (The extra letter "X" at the beginning was thrown in just to make the message a bit more mysterious.)
Codes have been used for centuries. Now, with the help of this entertaining book, you, too, will be able to decipher dozens of secret messages. Veteran cryptographer Bud Johnson not only describes the different techniques used in secret writing but also explains -- clearly and simply -- how to make and break six different kinds of codes: simple letter grouping, reverse trail, shift code, key word code, date shift code, and twisted path code. You'll even learn techniques for creating your own confidential messages!
Cartoons by illustrator Larry Daste accompany the 51 practice messages, along with easy-to-follow instructions explaining each type of code and how to use it. There's also a glossary defining common terms used by cryptographers, a sheet of reproducible graph paper for writing out messages, and a page of ready-made alphabets for shift and key word codes. And if all those funny drawings and helpful guidelines aren't enough to help you decode our secret messages, don't worry. Solutions are included at the end of the book.
Codes have been used for centuries. Now, with the help of this entertaining book, you, too, will be able to decipher dozens of secret messages. Veteran cryptographer Bud Johnson not only describes the different techniques used in secret writing but also explains -- clearly and simply -- how to make and break six different kinds of codes: simple letter grouping, reverse trail, shift code, key word code, date shift code, and twisted path code. You'll even learn techniques for creating your own confidential messages!
Cartoons by illustrator Larry Daste accompany the 51 practice messages, along with easy-to-follow instructions explaining each type of code and how to use it. There's also a glossary defining common terms used by cryptographers, a sheet of reproducible graph paper for writing out messages, and a page of ready-made alphabets for shift and key word codes. And if all those funny drawings and helpful guidelines aren't enough to help you decode our secret messages, don't worry. Solutions are included at the end of the book.
ISBN: 0486291464
SKU:31UI56003PCZ_ns
Note on Condition
Note on Condition
Most of the items in our store are used. The items condition is indicated at the top of the product page. Please refer to the following condition notes:
- Used - Good: The item shows wear from consistent use, but it remains in good condition and works perfectly. All pages and cover are intact (including the dust cover, if applicable). Spine may show signs of wear. Pages may include limited notes and highlighting. May NOT include discs, access code or other supplemental materials.
- Used- Acceptable: The item is very worn but continues to work perfectly. Signs of wear can include aestetic issues such as scratches, dents, worn and creased covers, folded page corners, and minor liquid stains. All pages and the cover are intact, but the dust cover may be missing. Pages may include moderate to heavy amount of notes and highlighting, but the text is not obscured or unreadable. Page edges may have foxing (age related spots and browning). May NOT include discs, access code or other supplemental materials.
- Used-Ex-Library (Good/Acceptable): Former library book with the usual stamps, stickers, and labels. See Good/Acceptable notes for more detail.
- Used- Very Good: Book has little sign of wear or use
- New- Brand new, unread book
Shipping & Local Pick Up
Shipping & Local Pick Up
Shipping: Most orders are shipped within 24 hours. Please allow 4-14 days after the item has shipped for delivery. Faster shipping is available for purchase at checkout.
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