C CyKin
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OPEN LIBRARY · PUBLIC SOURCE

Learn to think about
security clearly.

A journey through cybersecurity books, lessons and exercises for people and AI systems. Choose your path and study without an account.

Start learning Connect an AI
207courses mapped
23subject areas
9study levels
CyKinknowledge network
◈
Knowledgetechnical, open
✦
One lesson per chapterwith exercises
↗
Living sourcebooks kept current
START HERE

Two ways to find your next lesson.

Choose your route. Both paths show every subject in order and open chapters that have teaching text.

01◈

I have a subject in mind

Choose a language, subject and level. Open the course and follow its lessons in order.

Language→Subject→Level
02▤

I want to study a whole level

Choose a language and level. Browse all 23 subjects in curriculum order, with their lesson guides.

Language→Level→23 subjects
Move from the first subject to the last, lesson by lesson, with each book in reach.

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FROM CONCEPT TO PRACTICE

Learning you can verify.

Each subject is one chapter in its course book. The lesson page brings together explanations, examples, exercises and worked answers, with links to the previous chapter, index and next chapter.

Read the editorial standard →
01
Transparent source

Open text with its course and edition identified.

02
No entry barrier

Read courses, books and exercises without an account.

03
Ready for other AIs

Public API, Markdown and read-only MCP server.

FOR SYSTEMS AND AGENTS

A library other AIs can consult.

ChatGPT, Claude, DAI and other tools can discover courses and read lessons through MCP or the open API. Every response identifies its public manuscript.

Explore MCP access →