# NXP MIFARE DESFire 2K EV1 RFID Cards: A Comprehensive Guide ## Introduction to NXP MIFARE DESFire 2K EV1 RFID Cards In the realm of contactless smart card technology, **NXP MIFARE DESFire 2K EV1 RFID cards** represent a pinnacle of security, versatility, and performance. As someone who has worked extensively with various RFID systems across access control, public transportation, and event management projects, I can attest to the transformative impact of these cards. My journey began a decade ago when I first integrated basic 1K cards into a university dormitory system. The limitations were evident—limited memory, slower transaction times, and basic security. Transitioning to the DESFire platform, particularly the 2K EV1 variant, was like upgrading from a bicycle to a high-speed train. The difference wasn't just technical; it fundamentally changed how we designed systems, enabling multi-application environments where a single card could handle access, payments, and identity verification seamlessly. This personal experience underscores why understanding these cards is crucial for anyone in the RFID space. ## Technical Specifications and Parameters of NXP MIFARE DESFire 2K EV1 When evaluating **NXP MIFARE DESFire 2K EV1 RFID cards**, the technical details are paramount. These cards are built on the DESFire EV1 chip, which is based on a secure microcontroller with an integrated RF interface. Here are the key specifications: - **Memory Capacity:** 2 KB EEPROM, organized into 32 sectors with flexible file system support. - **Operating Frequency:** 13.56 MHz (ISO/IEC 14443 Type A standard). - **Communication Speed:** Up to 848 kbit/s, supporting fast data transfer for applications like transit ticketing. - **Security Features:** Includes AES-128 encryption, 3DES, and optional cryptographic co-processor for enhanced security. The chip has a Common Criteria EAL4+ certification, ensuring robust protection against attacks. - **Chip Code:** The specific IC identifier is NXP MF3ICD21 or MF3ICD21A, with a unique 7-byte UID (Serial Number) that can be extended to 4-byte or 7-byte formats. - **Detailed Dimensions:** Standard card size is 85.6 mm × 54 mm × 0.76 mm (ID-1 format), but custom sizes like key fobs or stickers are available, typically ranging from 25 mm to 50 mm in diameter for circular tags. - **Operating Temperature:** -25°C to +70°C,