Book

Description

Cryptography is no longer just a military tool. It is the invisible infrastructure behind every secure login, every online payment, and every protected message sent across the internet. However, understanding how it works, and how it can be broken, requires more than just theoretical knowledge. Cryptographic Applications and Network Security is written for students who need to do more than memorize definitions. Designed for undergraduate and postgraduate students of cybersecurity and computer science, this textbook is carefully aligned with the NBTE curriculum. It walks you through the core principles of cryptography, from the classical ciphers used by Julius Caesar to the modern algorithms that protect your bank account today. You will explore RSA, Diffie-Hellman, AES, hash functions, digital signatures, and Public Key Infrastructure. This book does not stop at theory. It transitions into hands-on network security, showing you how to use Python to analyze, craft, and secure network traffic. Using tools such as Scapy, PyShark, and Python's SSL library, you will learn how to build secure sockets, sniff packets, detect ARP spoofing, and perform vulnerability assessments. Whether you are calculating a Caesar cipher, implementing RSA, or writing a Python script to detect a SYN flood, this textbook provides both the practical skills and the theoretical foundation required to defend modern digital infrastructure.