This is an introduction to cryptography for developers. Cryptography refers almost exclusively to encryption, the process of converting ordinary information (plaintext) into unintelligible gibberish (i.e., ciphertext). Meet Cryptography A branch of both mathematics and computer science, cryptography is the study and practice of obscuring information. It describes dozens of cryptography algorithms, gives practical advice on how to implement them into cryptographic software, and shows how they can be used to solve security problems. Written for programmers and engineers, Practical Cryptography explains how you can use cryptography to maintain the privacy of computer data. For example, 7 is a divisor of 35 so we write 7j35.We call a number a prime number if it has exactly two divisors, namely 1 and itself. Primes 11.1 Divisibility and Primes A number a is a divisor of b (notation ajb, pronounced “a divides b”) if you can divide b by a without leaving a remainder. Contents keywords 1 1.1 The Perimeter of cryptography in Practice 7 1.2 Things That cryptographic Technologies cannot do 9 Click here to buy Practical Cryptography: Algorithms and Implementations Using C. The formal definition of cryptography could be noted in various ways however, one is enough if that sums up all the associated meanings. Suitable for undergraduate and postgraduate students in cryptography, network security, and other security-related courses, this book will also help anyone involved in computer and network security who wants to learn the nuts and bolts of practical cryptography. Covering the latest developments in practical cryptographic techniques, this book shows you how to build security into your computer applications, networks, and storage.

This book discusses the theories and concepts behind modern cryptography and demonstrates how to develop and implement cryptographic algorithms using C++ programming language.

The dramatic increase of information transmitted electronically has led to an increased reliance on cryptography. Cryptography, the science of encoding and decoding information, allows people to do online banking, online trading, and make online purchases, without worrying that their personal information is being compromised.

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