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Description
Codes and CiphersHow do you make invisible ink? Or disguise your speech? What's the best way of beating frequency analysis? What is a side channel attack? How does RSA end to end encryption actually work? In this illuminating little book, packed with helpful illustrations and worked examples, polymath Steven Goodwin reveals the secrets of the codermakers, and the toolkits of the codebreakers. If you ever wanted to send a secret message, then this book will show you
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.1 ★★★★★
Based on 2481 reviews
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Product Reviews
★★★★★ 5
Great devotional
Format: Hardcover
Great devotional thought Provking
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026
★★★★★ 5
Best devotional to start the day with
Beautifully written devotional. This is a must have in everyone’s library
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Reviewed in the United States on April 21, 2026
★★★★★ 5
Worth every penny!!
Color: Black
This kitchen sink caddy was exactly what I wanted. It's well made and small enough to fit on my new sink. It holds soap, dish rag or small sponge, drain stopper, and my two scrub brushes. Looks good, too
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Reviewed in the United States on March 19, 2026
★★★★★ 5
Great addition to my minimalist kitchen!
Color: Black
This kitchen sink sponge holder is simple yet highly effective. It keeps the sponge neatly in place, allows it to dry quickly, and makes the sink area look tidy. The sturdy material and easy-clean design make it a great little addition to any kitchen.
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Reviewed in the United States on May 7, 2026
★★★★★ 5
Strong sturdy reliable and versatile
Color: Black
This is a great little side piece to use for your kitchen sink or bathroom mine is in my kitchen sink it works great it sits on the side it's the perfect length holds my scrubber soap and other stuff I need instead of using a makeshift bowl. It's sturdy rust-resistant and I put it through the tests it gets wet every time I do which is every day in this house. You can use it for just about anything. There are no suction cups on it but there is a gray under it that catches all the loose water which is also very convenient. It looks modern and compliments most sinks and kitchens well
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Reviewed in the United States on September 27, 2025
