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DS28E25

Maxim Integrated Products
Part Number DS28E25
Manufacturer Maxim Integrated Products
Description DeepCover Secure Authenticator
Published Oct 5, 2012
Detailed Description ABRIDGED DATA SHEET EVALUATION KIT AVAILABLE DS28E25 DeepCover Secure Authenticator with 1-Wire SHA-256 and 4Kb User EE...
Datasheet PDF File DS28E25 PDF File

DS28E25
DS28E25

Overview
ABRIDGED DATA SHEET EVALUATION KIT AVAILABLE DS28E25 DeepCover Secure Authenticator with 1-Wire SHA-256 and 4Kb User EEPROM General Description 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 challengeand-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 readprotected 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-tohost 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-WireM 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.
Applications Authentication of Network-Attached Appliances Printer Cartridge ID/Authentication Reference Design License Management System Intellectual Property Protection Sensor/Accessory Authentication and Calibration...


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