<p>Donated distributed computing, also known as volunteer computing, is a form of distributed computing that is organized as a public donation of calculating resources. Donated calculating power can involve thousands of separate CPUs and it can achieve the performance of a supercomputer. In most of the cases donated distributed computing is organized by open source software, which can lead to the involvement of many more volunteers. This research focuses on cybersecurity issues when donated distributed computing is used for optimization with evolutionary algorithms.</p><p>This paper is included in the program of the Second Scientific Conference "Digital Transformation, Cyber Security and Resilience <a href="https://digilience.org/content/digilience-2020-program">DIGILIENCE 2020</a> and will be published in the post-conference volume.</p>