<h1>MIFARE One Card: A Comprehensive Guide</h1> <p>The <strong>MIFARE One card</strong> is a foundational technology in the world of contactless smart cards. From my personal experience working in access control system integration, I've seen firsthand how the MIFARE Classic platform, which the MIFARE One card is a part of, revolutionized secure entry systems in the early 2000s. Its simplicity and reliability made it a de facto standard for many years.</p> <h2>Understanding the Technology Behind MIFARE One</h2> <p>My technical skill lies in analyzing RFID protocols, and the <strong>MIFARE One card</strong> is a fascinating case study. It operates on the ISO/IEC 14443 Type A standard at 13.56 MHz. The core of its functionality is the proprietary encryption algorithm, which was a significant point of discussion in the security community. In my opinion, while its cryptographic strength has been superseded by newer standards like MIFARE DESFire, its historical impact on shaping the contactless card market is undeniable.</p> <h3>Technical Specifications and Parameters</h3> <p>For developers and integrators, understanding the detailed specs is crucial. Here are key technical indicators for a typical <strong>MIFARE One card</strong> (MIFARE Classic 1K):</p> <h4>Detailed Chip and Memory Specifications</h4> <ul> <li><strong>Chip Code:</strong> NXP MF1 IC S50</li> <li><strong>Memory:</strong> 1 KB EEPROM, organized into 16 sectors with 4 blocks each (64 blocks total).</li> <li><strong>Communication:</strong> 106 kbit/s data rate.</li> <li><strong>Anti-Collision:</strong> Typical operational range up to 10 cm.</li> <li><strong>Detailed Dimensions:</strong> Standard ID-1 format (85.6mm x 54mm x 0.76mm). Chip module size is typically around 5mm x 5mm.</li> <li><strong>Security:</strong> Utilizes CRYPTO1 stream cipher for mutual three-pass authentication. Each sector has two independent 48-bit keys (Key A and Key B).</li> </ul> <p><em>Note: These technical parameters are for reference data. For pre