These notes are useful for Diploma in Computer Engineering 6th Semester Students (MSBTE) Subject: Network & Information Security Topic:- Foundation of Computer Security Handwritten notes images are given below. Network and Information Security [NIS] ★Unit 1: Introduction to computer Network.★ 1.1: Foundations of Computer Security ★Foundation of Computer Security:- Defination:- Foundation of computer security refer to the essential principles, concepts and practices for protecting computer systems, networks and data / information from attacks and unauthorized access. ★Computer Security :- Defination:- Computer security refers to protecting and securing computers and their related data, network, unauthorized access, misuse, theft and other security issues. ★Need of computer security: 1. Protection of Data:- -Data is the most valuable asset. -Personal data, bank details, passwords, exam records must be protected. 2. Prevention of unauthorized Access:- -Only a...