The article analyzes current trends in the use of unique identifiers of the UUID (Universal Unique Identifier) type in databases for creating key records. It highlights areas of application of such identifiers in software systems across various domains and identifies relevant challenges related to their use in the context of modern data security requirements. The advantages of ULID (Universally Unique Lexicographically Sortable Identifier)—next-generation identifiers distinguished by higher performance and the ability to support lexicographical sorting through a monotonic generation principle—are examined. Based on an analysis of modern data protection needs, it is concluded that UUID-based identifiers require a high level of security, particularly against SQL (Structured Query Language), XSS (Cross-Site Scripting), CSRF (Cross-Site Request Forgery), and Insecure Direct Object Reference (IDOR) attacks. It is emphasized that protection methods must consider the specifics of the data types on which key identifiers are built. As an extension of security tools, a method for converting UUIDs into a graphical form visually resembling a unique chart is proposed. An algorithm and a diagra
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