Rostislav Petrov has been involved in computer security since his school years, and his hobby is becoming a job. He studied CCT at the Technical University and then continued his second higher education in London, where he is certified as a CEH - Certified Ethical Hacker, and later became a Certified Ethics Hacker with the world-recognized EC-Council certification - Certified EC-Council Instructor - CEI. Rostislav is a cybersecurity and ethics hacking teacher with over 20 years of experience in the field, and is also the founder of E.H.U. - Ethical Hacking University of Bulgaria. He is the author of the textbook The Basics of Ethical Hacking. He is the chairman of BASEX - Bulgarian Association of Certified Ethical Hackers. There are a number of acknowledgments behind the back for contributing to the cybersecurity of public and private enterprises. One of his achievements is to find a security hole in one of the world's most famous antivirus programs - Avast in 2015, which has garnered the attention of hundreds of hackers from the dark world and in 2018 discovered a security breach software from one of the largest encryption and data security companies, Locklizard, which gains access to highly confidential classified information.