Elin Kolev has been a specialist in information security and cryptography for more than 10 years. He holds a master's degree in Computer Systems and Networks. He has the following certificates: ITIL Foundation for IT Service management, Cryptographic security administrator, Linux Professional Institute - LPIC 2, Certified Ethical Hacker CEH. He has extensive experience in the provision of certification services, Regulation (EU) No 910/2014, Electronic Document and Electronic Certification Services Act, work with cryptographic devices - smart cards, Hardware Security Module (HSM), as well as the construction of systems based on Public Key Infrastructure. For 6 years he has been conducting trainings related to electronic signing of documents, creation and validation of a qualified electronic signature.