CN22/CN23

**Entry for 'CN22/CN23':** CN22 and CN23 are European technical standards that define the specifications for optical security features used in government-issued documents such as passports, identity cards, and banknotes. Developed by the European Committee for Standardization (CEN), these standards establish precise requirements for optical variable devices (OVDs) – security elements that change appearance when viewed from different angles or under varying lighting conditions. CN22 represents the foundational standard for basic optical security devices, while CN23 builds upon it with enhanced security features and stricter performance criteria. These standards ensure uniformity in security technology across European documents while providing robust protection against counterfeiting and forgery. The importance of CN22/CN23 standards lies in their role as critical countermeasures against document fraud, which affects everything from identity theft to financial crime. By establishing mandatory performance characteristics such as color shift ranges, viewing angle tolerances, and durability requirements, these standards enable governments and institutions to implement consistent, reliable security measures. The standards also facilitate international interoperability, allowing border control