Book Image

CompTIA Security+ Certification Guide

By : Ian Neil
Book Image

CompTIA Security+ Certification Guide

By: Ian Neil

Overview of this book

CompTIA Security+ is a worldwide certification that establishes the fundamental knowledge required to perform core security functions and pursue an IT security career. CompTIA Security+ Certification Guide is a best-in-class exam study guide that covers all of CompTIA Security+ 501 exam objectives. It is authored by Ian Neil, who is a world-class trainer of CompTIA Security+ 501. Packed with self-assessment scenarios and realistic exam questions, this guide will help you master the core concepts to succeed in the exam the first time you take it. Using relevant examples, you will learn all the important security fundamentals from Certificates and Encryption to Identity and Access Management concepts. You will then dive into the important domains of the exam; namely, threats, attacks and vulnerabilities, technologies and tools, architecture and design, risk management, and cryptography and Public Key Infrastructure (PKI). This book comes with over 600 practice questions with detailed explanation that is at the exam level and also includes two mock exams to help you with your study plan. This guide will ensure that encryption and certificates are made easy for you.
Table of Contents (18 chapters)
12
Mock Exam 1
13
Mock Exam 2
15
Acronyms

Asymmetric Algorithms

Asymmetric algorithms use a PKI environment as they use two keys: a private key and a public key. Let's now look at different asymmetric techniques.

Diffie Hellman (DH) does not encrypt data; its main purpose is to create a secure session so that symmetric data can travel down it. The DH handshake is shown in the following diagram:

Figure 9: Diffie Hellman

DH creates the keys used in the Internet Key Exchange (IKE); it uses UDP port 500 to set up the secure session for the L2TP/IPSec VPN. Once the secure tunnel has been created, then the symmetric encrypted data flows down the tunnel.

  • Rivest, Shamir, and Adelman (RSA): RSA is named after the three people who invented the algorithm. The keys were the first private and public key pairs, and they start at 1,024, 2046, 3,072 and 4,096 bits. They are used for encryption and digital signatures.
  • Digital Signature...