Centering on classical encryption methods spanning from the BCE era to the present day, this study systematically presents the fundamental principles of the discipline using the Turkish alphabet through aphorisms of figures who shaped world history, from Rumi to Mustafa Kemal Atatürk. Appealing to every age group from primary school to postgraduate level, the work blends encryption methods with their historical stories, aiming to take the reader on a journey of discovery through the mysterious world of mathematics. Reinforcing theoretical knowledge with practice through applied questions included at the end of each chapter, the book establishes a technical foundation for the continuation of the series that will cover modern algorithms, while serving as an original guide enriched with easy-to-apply methods that foster a love for mathematical thinking skills.