# The Mathematics of Encryption

American Mathematical Soc., Sep 5, 2013 - Mathematics - 332 pages

How quickly can you compute the remainder when dividing img style="width: 8px; height: 12px; margin-right: 0.069em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/120/0031.png"img style="width: 8px; height: 12px; margin-right: 0.038em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/120/0030.png"img style="width: 8px; height: 12px; margin-right: 0.042em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/120/0039.png"img style="width: 8px; height: 12px; margin-right: 0.041em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/120/0038.png"img style="width: 8px; height: 12px; margin-right: 0.041em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/120/0033.png"img style="width: 9px; height: 12px; margin-right: 0.014em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/120/0037.png" img style="width: 6px; height: 8px; margin-right: 0.041em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/085/0039.png"img style="width: 6px; height: 8px; margin-right: 0.014em;" src="http://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS/TeX/png/Main/Regular/085/0037.png"   by 120143? Why would you even want to compute this? And what does this have to do with cryptography?

Modern cryptography lies at the intersection of mathematics and computer sciences, involving number theory, algebra, computational complexity, fast algorithms, and even quantum mechanics. Many people think of codes in terms of spies, but in the information age, highly mathematical codes are used every day by almost everyone, whether at the bank ATM, at the grocery checkout, or at the keyboard when you access your email or purchase products online.

This book provides a historical and mathematical tour of cryptography, from classical ciphers to quantum cryptography. The authors introduce just enough mathematics to explore modern encryption methods, with nothing more than basic algebra and some elementary number theory being necessary. Complete expositions are given of the classical ciphers and the attacks on them, along with a detailed description of the famous Enigma system. The public-key system RSA is described, including a complete mathematical proof that it works. Numerous related topics are covered, such as efficiencies of algorithms, detecting and correcting errors, primality testing and digital signatures. The topics and exposition are carefully chosen to highlight mathematical thinking and problem solving. Each chapter ends with a collection of problems, ranging from straightforward applications to more challenging problems that introduce advanced topics. Unlike many books in the field, this book is aimed at a general liberal arts student, but without losing mathematical completeness.

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### Contents

 Methods 19 Enigma and Ultra 51 Attacks I 81 Attacks II 113 Modern Symmetric Encryption 133 Introduction to PublicChannel Cryptography 171 PublicChannel Cryptography 213
 Error Detecting and Correcting Codes 239 Modern Cryptography 269 Primality Testing and Factorization 289 Solutions to Selected Problems 317 Bibliography 325 Copyright