Hackers are often associated with hooded characters who steal our Facebook password or our money from the bank. Others may think about Russian or Chinese cybercriminals, who are sometimes the news heroes. Few people know about the existence of such a concept as an ethical hacker. The lecture will illustrate what such a person does and whether you can legally break the security of popular websites. Moreover, you will be able to find out what the hacker competition looks like, and this is something where the Polish team has proved to be the best in the world for the last two years. For those interested, there will also be a handful of tips on starting a career in this industry.