This book provides a comprehensive overview of the principles and concepts of cyber security and cryptography. It equips the readers with essential tools to perform cryptographic analysis of modern constructions, which is a vital skill for any individual learning and practicing cyber security. It emphasizes on the importance of rigor in the development of cryptographic systems highlighting the significance of sturdy and secure cryptographic techniques in cyber security. The book has been meticulously organized to help individuals understand the pre-requisites before covering the theoretical and practical aspects of the subject area.