DS28E25

Description

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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 secure challenge-and-response authentication functionality based on the FIPS 180-3-specified Secure Hash Algorithm (SHA-256) with 4Kb of user-programmable EEPROM. Additional secure memory holds a secret/key for SHA-256 operations. Each device has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip. The SHA-256 message authentication code (MAC), which the DS28E25 generates, is computed from data in the user memory, the SHA-256 secret, a host controller random challenge, and the 64-bit ROM ID. A secure and low-cost factory-programming service is available to pre-program device data including the SHA-256 secret. The DS28E25 communicates over Maxim's single-contact 1-Wire^® bus.

Key Features

• Symmetric-Key-Based Bidirectional Secure Authentication Model Based on SHA-256
• Sophisticated Die-Level Methods and Circuits for Tamper Protection of Sensitive Data and Signals
• 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
• ±8kV HBM ESD Protection (typ)
• 2-Pin SFN, 2-Pin TO-92, 6-Pin TDFN, and 6-Pin TSOC Packages

Applications/Uses

• Identification and authentication of consumables
• Reference Design License Management
• Sensor/Accessory Authentication and Calibration
• System Intellectual Property Protection