In current world, Information is an important asset to everyone. In Business, where information plays a key role in success of any company. Business plans, customer database, product blueprints and road-maps are some of important example of information assets to any organization. At personal level, losing important files, leaked emails, passwords, misuse of Credit cards are some of the examples, which every individual fear of in free flowing world of Internet. Information security is the collection of technologies, standards, policies and management practices that are applied to information to keep it secure. This course provides overview on some of the basic concepts laying foundation for any secure system. Under short but precise multiple video lectures, we will talk about some of information security concepts and possible attack scenarios compromising security of the system. Some of the discussed topics are Cryptography, PKI, Digital Certificates, SSL/TLS protocols and many more.