Hackers manage again and again to steal passwords, to access sensitive enterprise and user data, and, in the worst case scenario, to even paralyze entire companies. The Internet offers various possibilities to its users, but, at the same time, it harbors dangers and vulnerable points of attack, which many people are not even aware of. In this openHPI course you will learn the basics of Internet security. Why is the Internet insecure by nature of its design? What are the weak spots of the Internet and how are they exploited by cybercriminals? We want to answer these questions and a lot more in this course. Additionally, we will advise you on how to protect yourself from such cyberattacks.