Based on years of experience in teaching undergraduate and graduate students, the authors have written the textbook Digital Authentication Technology. The book is divided into two parts: the basics and the advanced, totaling 12 chapters, covering the basics of digital authentication technology, algebra and cryptography fundamentals, authentication theory fundamentals, data integrity verification, digital source authentication and digital signatures, identity authentication, multimedia authentication, and biometric authentication. It covers the main knowledge points for undergraduate and graduate teaching in cybersecurity. The book is characterized by its emphasis on the systematicness of digital authentication technology and the cultivation of students’ abilities in security protocol design. To enable undergraduate students to intuitively understand various digital authentication schemes, the book provides numerous detailed application examples for reference, along with a substantial number of exercises for after-class reflection and practice. The book can serve as a textbook or reference book for “Digital Authentication Technology” in the field of cybersecurity and related courses. It is also suitable for relevant majors in applied undergraduate and adult education institutions.