DeepCover Secure Authenticator iButton with SHA-256

World-Class Security in Stainless Steel Case for Durable Secure Authentication

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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 i Button® (DS1964S) 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 512-bit user-programmable EEPROM array provides nonvolatile storage of application data. Additional protected memory holds a read-protected secret for SHA-256 operations and settings for memory protection 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 DS1964S. Slave-to-host authentication is used by a host system to securely validate that an attached or embedded DS1964S is authentic. The DS1964S 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 multidevice 1-Wire network.

DS1964S: Block Diagram DS1964S: Block Diagram Enlarge+

Key Features

  • Symmetric-Key-Based Bidirectional Secure Authentication Model Based on SHA-256
  • Strong Authentication with a High-Bit-Count User-Programmable Secret and Input Challenge
  • 512 Bits of User EEPROM Partitioned Into Two Pages of 256 Bits
  • User-Programmable and Irreversible EEPROM Protection Modes Including Write and Read Protect and OTP/EPROM Emulation
  • Unique Factory-Programmed, 64-Bit Identification Number
  • Single-Contact 1-Wire Interfac
  • Operating Range: -40℃ to +85℃
  • ±8kV HBM ESD Protection (typ)
  • Durable Stainless-Steel Enclosure Withstands Harsh Environments and Conditions


  • Authentication of Consumables
  • Secure Feature Control

See parametric specs for Secure Authenticators (33)

Part NumberCrypto EngineApplicationsMemory TypeMemory SizeBus TypeVSUPPLY
Deep CoverOper. Temp.
See Notes
DS1964S Symmetric
Access Control
Asset Tracking
IP Protection
Identification Systems
Medical Consumable ID
Secure Access Control
EEPROM512 bits1-Wire2.97 to 3.63Yes-40 to +85
$2.29 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

DS1964SEVKIT: Evaluation Kit for the DS1964S

Technical Documents

App Note 7015 Back to Basics: Secure Hash Algorithms
Brochure 7011 iButton Data Loggers
User Guide 6614 DS1964S Security User Guide
App Note 3808 What Is an iButton Device?
Tutorial 1796 Guide to 1-Wire Communication
Request Reliability Report for: DS1964S 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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