Book Image

Modern Cryptography for Cybersecurity Professionals

By : Lisa Bock
Book Image

Modern Cryptography for Cybersecurity Professionals

By: Lisa Bock

Overview of this book

In today's world, it is important to have confidence in your data storage and transmission strategy. Cryptography can provide you with this confidentiality, integrity, authentication, and non-repudiation. But are you aware of just what exactly is involved in using cryptographic techniques? Modern Cryptography for Cybersecurity Professionals helps you to gain a better understanding of the cryptographic elements necessary to secure your data. The book begins by helping you to understand why we need to secure data and how encryption can provide protection, whether it be in motion or at rest. You'll then delve into symmetric and asymmetric encryption and discover how a hash is used. As you advance, you'll see how the public key infrastructure (PKI) and certificates build trust between parties, so that we can confidently encrypt and exchange data. Finally, you'll explore the practical applications of cryptographic techniques, including passwords, email, and blockchain technology, along with securely transmitting data using a virtual private network (VPN). By the end of this cryptography book, you'll have gained a solid understanding of cryptographic techniques and terms, learned how symmetric and asymmetric encryption and hashed are used, and recognized the importance of key management and the PKI.
Table of Contents (16 chapters)
Section 1: Securing Our Data
Section 2: Understanding Cryptographic Techniques
Section 3: Applying Cryptography in Today's World


In this chapter, we learned how a hash algorithm is a one-way function that takes a variable-length block of text and creates a fixed-length output. The output is referred to as a message digest. A message digest can be used in a variety of applications. We saw how it can ensure file integrity, create a digital signature, or verify a password. In addition, we can use a hash to identify data within a hash table and create a blockchain.

Not all hash algorithms are created equal in that there are several optimal hash properties. We reviewed these properties, including the one-way nature of the algorithm in that the message digest bears no resemblance to the original text. We also saw how a hash needs to consistently create the same hash every time the algorithm is run on a block of data. And we learned that one of the more important properties is collision resistance.

We reviewed several common hash algorithms, namely those in the message digest and SHA families. We know...