TSS222 is part of the Security Services Access Control Standards (SSAC) developed by the International Organization for Standardization (ISO) in an effort to provide security standards for electronic and communications services worldwide in order to enhance privacy and protect personal data from unauthorized access and theft. TSS222 is the technical specification part of SSAC and it describes the baseline requirements for various access control systems, including authentication, authorisation, and audit categories, as well as the technical requirements for implementing these access control systems.