iCLASS Seos vs MIFARE Plus EV1

Choose iCLASS Seos if you need multi-technology backwards compatibility in existing physical access control systems. This credential combines 13.56 MHz Seos (8 KB memory, ISO/IEC 14443-A), 13.56 MHz iCLASS (2k or 32k bit, ISO 15693), and 125 kHz Prox (512 bits, ISO 11784/11785) in a single card, allowing seamless migration from legacy 125 kHz systems to modern Seos deployments. The Seos technology provides Extended Privacy Support with optional static UID, multiple logical records, data groups, and HID Global SIO Data Object Support for managing identity credentials across enterprise environments. This solution is optimal for large organizations gradually upgrading infrastructure where older readers must coexist with new installations, eliminating the need to swap out all readers simultaneously during migration projects. Choose MIFARE Plus EV1 if you require AES-128 cryptographic security in a pure 13.56 MHz ISO/IEC 14443-A environment with standards-based APDU support. Available in 2 KB (2048 bytes, 32 sectors × 4 blocks) or 4 KB (4096 bytes, 40 total sectors) EEPROM configurations, MIFARE Plus EV1 offers AES-128 authentication, data integrity protection, secure messaging, and relay attack protection through proximity checking. It maintains CRYPTO1 backward compatibility in Security Level 1 for legacy MIFARE Classic systems while providing ECC originality signatures, Transaction MAC, and Common Criteria EAL5+ targeted certification. Anti-tearing protection ensures data integrity during power loss. This chip suits transit ticketing, event access, campus cards, and payment applications requiring strong cryptography, ISO/IEC 7816-4 compatibility, and protection against cloning through originality verification, especially where MIFARE ecosystems already exist.