Introduction

Introduction#

Welcome to an open educational resource that bridges the gap between rigorous theory and hands-on practice in cybersecurity. This book is designed so that instructors can assemble a course from self-contained chapters, and so that learners preparing for certifications such as CompTIA Security+, Certified Ethical Hacker (CEH), and Certified Information Systems Security Professional (CISSP) can study the relevant material directly. It is written to be read on several levels at once, accessible to a motivated high-school or summer-camp student, rigorous enough for undergraduate and graduate courses, and deep enough, through its “Going Deeper” sections, to interest doctoral and postdoctoral readers.

A live, continuously updated web version of this book is available at https://book.com.puter.tips/

Course Mapping#

The chapters map cleanly onto standard three-credit university courses. Instructors can mix and match chapters to match their exact syllabus.

Course

Recommended Chapters

Approx. Pages

Introduction to IT Security

1, 2, 3, 4, 5, 19

175

Ethical Hacking

1, 6, 7, 8, 9, 10, 16

115

Computer and Network Security

2, 3, 5, 11, 12, 17

175

Fundamentals of Cryptography

2, 3, 11, 17

140

Incident Response and Digital Forensics

12, 13, 14, 15

45

Cybersecurity and Society

1, 4, 5, 17, 18, 19, 20

130

Capstone or Certification Prep

All chapters

375 (about 447 with appendices)

The page counts are approximate and based on the PDF edition, counting only the listed chapters (not the appendices). They are a planning aid for gauging reading load per course; the full book runs about 447 pages including all appendices.

The appendices map every chapter to the CISSP, Security+, CEH, CISA, and CGRC certification domains (Appendix C) and to ABET student outcomes and Bloom’s taxonomy levels (Appendix D), and they provide a command reference, a glossary, pointers to companion publications and code, and a protocol security reference (Appendices A, B, E, F, I).

The book is also aligned to the major workforce and framework standards. Its structure and learning objectives map to the six functions of the NIST Cybersecurity Framework (CSF) 2.0, Govern, Identify, Protect, Detect, Respond, and Recover, which are treated directly in the governance and defense chapters. The skills taught correspond to the work roles of the NICE Workforce Framework for Cybersecurity (NIST SP 800-181r1), so instructors can connect chapters to specific job functions. Finally, the learning objectives and review questions are written against Bloom’s taxonomy, progressing from remembering and understanding toward applying, analyzing, and evaluating, with the full chapter-by-chapter Bloom’s mapping given in Appendix D.

What Every Chapter Contains#

Most chapters are structured around a consistent set of pedagogical features: learning objectives, key terms with full acronym expansions, detailed prose with figures and architecture diagrams, a Why This Matters section, a News in Focus box drawn from documented incidents, worked numerical examples, knowledge-check questions, multiple-choice questions with answers, executable Python coding exercises, hands-on lab assignments, in-class exercises, and references in a consistent style.

How to Cite This Book#

If you use this textbook in research, teaching, or writing, please cite it. A machine-readable CITATION.cff file is included in the repository (GitHub displays a “Cite this repository” button that generates these formats automatically). Replace the year and access date as appropriate for your edition.

The work also has a permanent Digital Object Identifier (DOI) via Zenodo: 10.5281/zenodo.20575785 (https://doi.org/10.5281/zenodo.20575785). Please cite the DOI where possible.

APA (7th edition):

Trivedi, D. (2026). Cybersecurity: Theory, Practice, and Ethics. Zenodo. https://doi.org/10.5281/zenodo.20575785

IEEE:

D. Trivedi, Cybersecurity: Theory, Practice, and Ethics. Zenodo, 2026. doi: 10.5281/zenodo.20575785.

MLA (9th edition):

Trivedi, Devharsh. Cybersecurity: Theory, Practice, and Ethics. Zenodo, 2026, doi:10.5281/zenodo.20575785.

Chicago (author-date):

Trivedi, Devharsh. 2026. Cybersecurity: Theory, Practice, and Ethics. Zenodo. https://doi.org/10.5281/zenodo.20575785.

BibTeX:

@book{trivedi2026cybersecurity,
  author    = {Trivedi, Devharsh},
  title     = {Cybersecurity: Theory, Practice, and Ethics},
  year      = {2026},
  publisher = {Zenodo},
  doi       = {10.5281/zenodo.20575785},
  url       = {https://doi.org/10.5281/zenodo.20575785},
  note      = {Free, open-source textbook, CC BY 4.0}
}

To cite a specific chapter, add the chapter title and number, for example: Trivedi, D. (2026). Cryptography (Chapter 2). In Cybersecurity: Theory, Practice, and Ethics. https://book.com.puter.tips

Accessibility#

This book is designed to be usable by everyone, including readers who rely on assistive technology, and it is published as a live website so that it benefits from the accessibility features of the web. Specific measures include the following.

  • Semantic structure. Every page uses a single top-level title followed by a strict, non-skipping heading hierarchy, so screen readers (such as NVDA on Windows or VoiceOver on macOS and iOS) can build an accurate outline and let readers jump between sections. The sidebar table of contents, the search box, and the General Index (linked in the navigation) provide multiple ways to find content without scrolling.

  • Text alternatives for visuals. Every figure carries descriptive alternative text, and each diagram is accompanied by an adjacent prose explanation in the body text, so no information is conveyed by an image alone. Architecture and flow diagrams are also provided as text-based diagrams that render as structured markup rather than flat pictures.

  • Readable, resizable text. The site uses a responsive, reflowable layout with relative font sizes, so readers can zoom or change the browser font size without losing content, and it ships with a built-in light and dark theme. Body text is left-aligned to avoid the uneven spacing that can hinder readers with dyslexia.

  • Language and navigation. The document declares its language (English) so screen readers use the correct pronunciation, links use descriptive text rather than “click here,” and all navigation, search, and content links are reachable by keyboard alone.

  • Standards. These choices follow the Web Content Accessibility Guidelines (WCAG), including the recommended minimum 4.5:1 contrast ratio for normal text.

If you encounter an accessibility barrier, please open an issue in the book’s repository (linked from the toolbar) so it can be fixed. Because the source is openly licensed (below), readers may also generate alternative formats to suit their needs.

License#

This textbook is released under the Creative Commons Attribution 4.0 International (CC BY 4.0) license. You are free to share and adapt the material with appropriate credit.