His article provides an overview of the main digital certificate data formats used to ensure information security and authentication in computer networks. In particular, it examines the most common formats – X.509, PGP, OpenPGP, PKCS – their structure, areas of application, advantages, and disadvantages. The study analyzes how different formats affect compatibility between software tools and presents examples of each format's use in modern security systems. The material may be useful for cybersecurity professionals, system administrators, and softw are developers working with certificates.
