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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 695 reviews
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Product Reviews
★★★★★ 5
Great for dogs who love to play tug
Great for our 2 dogs who love to play tug.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 23, 2026
★★★★★ 4
Great toy for a puppy
I got these set of rope toys to occupy my new puppy who is teething. He loves it and cannot put him down. Keep him busy that’s for sure. Only issue is I’ve had it for probably three months now and after a while, the rope/string strings start to fry so you just have to cut them, but it was a good choice. I would buy it again.
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Reviewed in the United States on March 11, 2026
★★★★★ 5
Well worth the reasonable price!
My dogs love these. They hold up well to chewing and tugging. They’re a hit and will buy on repeat!
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Reviewed in the United States on May 17, 2026
★★★★★ 3
Came apart too quickly
Came apart too quickly but my dog loved it.
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Hard diameter to find
I took a chance on these ropes being the right size diameter for my English Bulldog. So many times in pet stores they either have just the huge diameter for the large breed dogs or the very small diameter and length for the little dogs. These were perfect and a great value getting two ropes of the same size.
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Reviewed in the United States on January 14, 2026
