Cyber security is related to technological development that is dynamic and comprehensive in the field of communication and information technology. It includes a set of processes, measures and standards that guarantee a certain level of reliability when using products and services in cyberspace. The area of cyber security itself is extremely important for the functioning of a number of institutions from different sectors of society, and adequate management is the basis of the success of any organisation. Considering accelerated digitalisation within companies and sectors of society due to the COVID-19 pandemic, cyber threats have recorded a continuous increase both locally and globally. Different types of attacks in cyberspace are becoming more and more frequent and affect our daily life and business. From the beginning of the pandemic to today, we have seen an increase in malicious programs, computer fraud, misuse of personal and financial data, and for this very reason, it is important to be aware of possible cyber threats and adequate ways to prevent and protect against them. The aim of this thesis is to analyse the impact of the COVID-19 pandemic on cyber security and the consequent increase in cyber crime. In the first part of thesis, the aspects and significance of cyber security will be explained, the relationship between information and cyber security will be defined, and the legal framework will be presented. Then, threats will be defined through the categorisation of malicious attacks and types of cyber attacks and incidents during the COVID-19 pandemic in Croatia and the world. Furthermore, the impact of the COVID-19 pandemic on the increase in cybercrime will be analysed in detail, and a conclusion will be drawn at the end.