What this book covers
Chapter 1, Protecting Data in Motion or at Rest, provides an overview of the current threat landscape. You'll learn how encryption provides many security services, such as confidentiality, integrity, and authentication. We'll then review some common terms, along with two basic cryptographic concepts: substitution and transposition.
Chapter 2, The Evolution of Ciphers, takes us through some early uses of cryptography. We'll review monoalphabetic and polyalphabetic ciphers and compare different methods used to encode transmissions during wartime. We'll then learn about the development of the Lucifer and Feistel ciphers, as scientists recognized the need to secure digital data.
Chapter 3, Evaluating Network Attacks, compares passive and active attacks and outlines why it's essential to protect data so that it remains in its original, unaltered form. You'll then learn how using encryption can ensure data integrity and prevent it from being changed, destroyed, or lost in an unauthorized or accidental manner.
Chapter 4, Introducing Symmetric Encryption, steps through the evolution of symmetric (or secret key) encryption. We'll examine common algorithms, such as the Advanced Encryption Standard. We'll then dissect block and stream ciphers and compare the different operating modes. Finally, we'll take a look at some methods of securing wireless communications.
Chapter 5, Dissecting Asymmetric Encryption, outlines how asymmetric (or public key) encryption can be used in many ways, such as exchanging the shared secret key, securing email, and creating a digital signature. We'll compare algorithms such as Rivest, Shamir, Adleman (RSA) and Diffie-Hellman, along with a discussion on key management.
Chapter 6, Examining Hash Algorithms, explains that a hash algorithm is a one-way function that produces a fixed-length output called a message digest. We'll identify some of the optimal hash properties along with some common hash algorithms in use today. Finally, you'll learn how a message digest provides message authentication.
Chapter 7, Adhering to Standards, explains that security laws and standards exist to provide guidelines and best practices to prevent data loss. In addition, we'll compare ways that we can use encryption to protect data, but also how cybercriminals use encryption to conceal malicious activity.
Chapter 8, Using a Public Key Infrastructure, outlines how the Public Key Infrastructure (PKI) framework provides trust between two entities communicating on the internet by using a trusted third party that enables secure interactions between entities. We'll discuss key management and examine what happens when both parties exchange a certificate.
Chapter 9, Exploring IPsec and TLS, combines all of your knowledge of cryptography as we examine the concepts of a VPN. We'll begin by outlining several types of VPNs in use today and explain the concept of an Internet Protocol Security (IPsec) VPN, along with a Transport Layer Security (TLS) communication stream.
Chapter 10, Protecting Cryptographic Techniques, reviews common attacks designed to alter the integrity of our data or systems. We'll recognize how the PKI can be attacked, which can negate trust. Finally, we'll see how advances in technology will require quantum-resistant algorithms to encrypt and secure our data.