# Mifare Classic 1K: A Comprehensive Guide ## Introduction to Mifare Classic 1K **Mifare Classic 1K** is one of the most widely used contactless smart card technologies in the world. From my personal experience working in access control systems, I've seen firsthand how these cards revolutionized secure entry for offices and residential buildings. The reliability and simplicity of **Mifare Classic 1K** made it a go-to solution for many security applications during its peak adoption period. ## Technical Specifications of Mifare Classic 1K ### Physical and Electrical Characteristics - **Dimensions**: Standard ISO/IEC 7810 ID-1 format (85.6mm × 54mm × 0.76mm) - **Operating Frequency**: 13.56 MHz - **Communication Speed**: 106 kbit/s - **Operating Distance**: Up to 10 cm (depending on reader configuration) - **Data Retention**: Minimum 10 years - **Write Endurance**: Minimum 100,000 cycles ### Memory Structure and Organization - **Total Memory**: 1024 bytes (1K) EEPROM - **Memory Organization**: 16 sectors, each containing 4 blocks - **Block Size**: 16 bytes per block - **Sector Structure**: - 3 data blocks (48 bytes) per sector - 1 sector trailer block (16 bytes) containing two keys (Key A and Key B) and access conditions - **Unique Identifier (UID)**: 4-byte or 7-byte serial number (manufacturer dependent) ### Security Features - **Crypto Algorithm**: Proprietary CRYPTO1 stream cipher - **Authentication**: Mutual three-pass authentication - **Access Control**: Configurable access conditions for each memory sector - **Key Storage**: Two 48-bit keys (Key A and Key B) per sector *Note: These technical parameters are reference data. For specific implementation details, please contact backend management.* ## My Experience with Mifare Classic 1K Development I discovered my natural aptitude for RFID technology while working on a university project involving **Mifare Classic 1K** cards. What began as a simple access system evolved into a comprehensive campus solution that handled everything from library book tracking to cafeteria payments. This hands-on experience taught me that while **Mifare Classic 1K** has known security vulnerabilities, its widespread adoption and straightforward implementation make it valuab