مدار مجتمع (آی سی) آی سی‌کاربرد ویژه

Product Attributes

Introduction

DeepCover embedded security solutions cloak sensitive data under multiple layers of advanced physical security to provide the most secure key storage possible. The DeepCover Secure Authenticator (DS28E25) combines crypto-strong, bidirectional, secure challenge-and-response authentication functionality with an implementation based on the FIPS 180-3-specified Secure Hash Algorithm (SHA-256). A 4Kb user-programmable EEPROM array provides nonvolatile storage of application data and additional protected memory holds a read-protected secret for SHA-256 operations and settings for user memory control. Each device has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip. This unique ROM ID is used as a fundamental input parameter for cryptographic operations and also serves as an electronic serial number within the application. A bidirectional security model enables two-way authentication between a host system and slave-embedded DS28E25. Slave-to-host authentication is used by a host system to securely validate that an attached or embedded DS28E25 is authentic. Host-to-slave authentication is used to protect DS28E25 user memory from being modified by a nonauthentic host. The SHA-256 message authentication code (MAC), which the DS28E25 generates, is computed from data in the user memory, an on-chip secret, a host random challenge, and the 64-bit ROM ID. The DS28E25 communicates over the single-contact 1-Wire bus at overdrive speed. The communication follows the 1-Wire protocol with the ROM ID acting as node address in the case of a multiple-device 1-Wire network.

Features

• Symmetric Key-Based Bidirectional Secure Authentication Model Based on SHA-256
• Dedicated Hardware-Accelerated SHA Engine for Generating SHA-256 MACs
• Strong Authentication with a High Bit Count, User-Programmable Secret, and Input Challenge
• 4096 Bits of User EEPROM Partitioned Into 16 Pages of 256 Bits
• User-Programmable and Irreversible EEPROM Protection Modes Including Authentication, Write and Read Protect, and OTP/EPROM Emulation
• Unique, Factory-Programmed 64-Bit Identification Number
• Single-Contact 1-Wire Interface Communicates with Host at Up to 76.9kbps
• Operating Range: 3.3V ±10%, -40°C to +85°C
• Low-Power 5μA (typ) Standby
• ±8KV Human Body Model ESD Protection (typ)
• 2-Pin SFN, 2-Pin TO-92, 6-Pin TDFN, and 6-Pin TSOC Packages

Applications

• Authentication of Network-Attached Appliances
• Printer Cartridge ID/Authentication
• Reference Design License Management
• System Intellectual Property Protection
• Sensor/Accessory Authentication and Calibration
• Secure Feature Setting for Configurable Systems
• Key Generation and Exchange for Cryptographic Systems