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Ships within 48 hours · Estimated delivery Jun 29 - Jul 4
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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
4.0 ★★★★★
Based on 841 reviews
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Product Reviews
★★★★★ 5
Excellent
Size: Small, Color: Blue
Excellent
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 13, 2026
★★★★★ 3
Fair product. Not for heavy chewer
Size: Small, Color: Pink
Not for a heavy cheer. Some of the set was easily broken
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 22, 2026
★★★★★ 5
teething life saver
Size: Small, Color: Pink
these toys were a lifesaver when my dog was teething in her puppy phase! they’re so durable and lasted forever. one of the only toys that lasted through her puppy phase and didn’t get absolutely destroyed!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 22, 2026
★★★★★ 5
Great buy
Size: Small, Color: Pink
❤️ them! Great price
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 1, 2026
★★★★★ 5
Amazing and cute
Size: Small, Color: Pink, Size: Small, Color: Pink
I have a puppy who absolutely adores her toys, especially now that she’s teething! I picked out some pink ones that are just right for her—she’s only 2 1/2 months old and weighs 2 lbs. The best part is the variety of toys she loves to play with.
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Reviewed in the United States on June 10, 2026
