 When I was a student at my Ukrainian university, it was after the collapse of the Soviet Union and some military officers who taught such security courses for the army, they came to my university. I was very interested in such security courses. It was really exciting for me and I decided to join such a research team and for now I understand that it was quite the right decision. This block cipher was developed to be used instead of an old Soviet standard. So Ukraine for many years used very old standard which was developed by the Soviet Union. And when this standard became obsolete, we began to do researches in this direction and we developed quite new block cipher. The block cipher which has very good properties, it was published in English, it was researched by several international teams and we got very positive feedback for it. I heard about it several years ago. I didn't pay much attention for it because I was very busy with my habilitation dissertation with the new block cipher and very many other problems with giving courses at international universities in South Korea in Norway. But when I got a little bit more free time, when I looked for the new research directions, and I finished this national project with the block cipher, I found that this is quite interesting topic and I decided to join this topic. I was very lucky to meet the founders of IOHK and I joined this research team and it's very interesting to work in this area.