1-Wire SHA-256 Authenticator with 4Kb User EEPROM

Provides World Class Authentication Security to Protect Your Development Investment

Overview

Technical Documents

Ordering Info

Status

Future Product

Description

The 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.

Data Sheet

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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
Unique Factory-Programmed 64-Bit Identification Number
Single-Contact 1-Wire® Interface Communicates with Host at Up to 15.4kbps at Standard Speed or Up to 76.9kbps in Overdrive Mode
Operating Range: 3.3V ±10%, -40°C to +55°C
±8kV HBM ESD Protection (typ)

Applications/Uses

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

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

This page last modified: 2011-11-01