<h1>Desfire Cards: Advanced Security and Versatile Applications</h1> <p><strong>Desfire cards</strong> represent a significant evolution in contactless smart card technology, offering enhanced security and memory for a wide range of applications. Based on my experience in access control system integration, migrating from older MIFARE Classic cards to <strong>Desfire cards</strong> was a game-changer for our clients' security posture. The inherent cryptographic protection gave us, as integrators, much greater confidence in the system's resilience against cloning and replay attacks.</p> <h2>Technical Specifications and Parameters of Desfire Card Products</h2> <p>When selecting a <strong>Desfire card</strong>, understanding the technical specifications is crucial. Here are detailed parameters for a typical DESFire EV2 chip module, which TIANJUN can provide as part of its secure card solutions. <em>Please note: These technical parameters are for reference; for exact specifications, you must contact backend management.</em></p> <h3>Core Chip Specifications</h3> <h4>NXP MIFARE DESFire EV2 (MF3DHx2/MF3DHx3) Series</h4> <ul> <li><strong>Chip Code:</strong> MF3DH2202 / MF3DH2302</li> <li><strong>Memory Size:</strong> 2KB / 4KB / 8KB EEPROM</li> <li><strong>Communication Interface:</strong> ISO/IEC 14443 A, up to 848 kbit/s</li> <li><strong>Security:</strong> AES-128, 3DES, optional 3-pass mutual authentication</li> <li><strong>Operating Frequency:</strong> 13.56 MHz</li> <li><strong>Data Retention:</strong> Up to 10 years</li> <li><strong>Write Endurance:</strong> 500,000 cycles minimum</li> </ul> <h3>Physical Card Dimensions (ISO/IEC 7810 ID-1)</h3> <ul> <li><strong>Standard Size:</strong> 85.60 mm × 53.98 mm × 0.76 mm</li> <li><strong>Chip Module Location:</strong> Defined by ISO/IEC 7816</li> <li><strong>Material:</strong> PVC, PET, or Polycarbonate</li> </ul> <h2>Personal Skill Application: Programming a Multi-Application Card</h2> <p>A personal skill I developed was programming <s