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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
4.2 ★★★★★
Based on 1553 reviews
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Product Reviews
★★★★★ 4
Great Products
Great products for prepping your skin for a flawless makeup finish.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 31, 2025
★★★★★ 5
Great samples!
A great kit to try new products. I will purchase all Thayer’s products again!
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Perfect for travel
Love this product but this is perfect for a carry on for a plane.
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Reviewed in the United States on May 16, 2026
★★★★★ 5
Best for nighttime skincare
These worked so well for me. I have extremely sensitive dry skin and I break out from most products. I use these 2 every night after the cerave hydrating facial cleanser, and then I use the embryolisse moisturizer to lock it all in. My skin is smooth and hydrated. I get told all the time that i have baby skin. I'm 25 years old.
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Reviewed in the United States on January 18, 2026
★★★★★ 5
Easy to use & provide great light!
I bought two lights for our patio. I love them. They have low and high light settings, which is wonderful. They're easily attached to the umbrella! I was pleased with the quality.
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Reviewed in the United States on June 18, 2025
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