X2 Smart Card Alliance

| Initiative | Description | |------------|-------------| | | Defines mandatory and optional card commands, file structure, and authentication mechanisms to ensure any X2-compliant card works across readers from different vendors. | | X2 Trust Framework | Certificate authority and key diversification guidelines for issuing X2 credentials in government and enterprise environments. | | Biometric Binding | Standardizes how biometric templates (finger, iris) are stored on-card and matched off-card vs. on-card. | | X2 Mobile Extension | Enables digital twin of the physical card inside a secure enclave (eSE, TEE) for smartphone-based access. |

The report highlights several security advantages of the SE approach: x2 smart card alliance

Beyond technical specs, the report addresses the complex business ecosystem required to make X2 payments work. It discusses the roles of: on-card