★Exceptionally easy to understand with all pages in full color★ Masaru-san (Masaru's Study Room channel), whose support videos on YouTube are popular, clearly explains the essential basic knowledge for support professionals! The complex mechanisms of information security are easy to understand with abundant color illustrations! Reproduces the popular explanations from the channel, with over 5 million views (as of August 2023), in print! ★What's amazing!★ 【Part 1】 Explains the basic knowledge of frequently tested important themes! You can quickly read through the core basic knowledge, making it easier to grasp the overall picture of the exam content! It's the first step before tackling a thick, full-fledged textbook. Your understanding will improve afterward! 【Part 2】 Abundant illustrations in full color! This book is structured with one theme per spread, with explanations on the left page and illustrations on the right. You can learn the actually interesting mechanisms of information security in an engaging way with color illustrations! 【Part 3】 A compact book that can be read in 10 hours! The basic knowledge necessary for passing the exam is condensed into one book. Each theme is completed in two pages, so you can read it smoothly even when you're busy! Chapter 1: Cryptographic Technology Chapter 2: Authentication Technology Chapter 3: Network Security Chapter 4: Server Security Technology Chapter 5: Client Security Chapter 6: Email Security Chapter 7: HTTP Security Chapter 8: Unauthorized Access and Attack Methods Chapter 9: Technologies in the Spotlight