The master thesis is written interdisciplinary, since it combines informatics and museology. The aim is to investigate the current problems of black online markets, where, with many criminal acts, illegal trafficking of art and antiques is becoming more and more prevalent. It is a relatively new, growing problem that is being tackled, monitored and analyzed by the international heritage community and law enforcement agencies on an everyday basis, and efforts are being made to create new instruments to protect cultural and human identity. The question taken as the backbone of the work is the comparison of the illicit trade in art and antiquities in the past and today, with the criminal acts that are linked to the said process. Researching the literature, which includes books, articles and websites, the results show that the art trade has become much more sophisticated today than in the past, as we are in an information age where it is increasingly accessible but also harder to follow. Much more violence is involved in the process itself, the works of art are of much greater value, both historical and traditional, same as financial. It also questions the authenticity of the object and the originality of the object's origin, as there are more and more objects on the Dark web that are forgeries with questionable origin, unknown owners, incomplete descriptions and information. Most objects appear on the market without supporting documentation and confirmation of ownership, which entails greater potential for fraudulent leads and a loss of confidence in art dealers.