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

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-to-host authentication is used by a host system to securely validate that an attached or embedded DS28E25 is authentic. Hostto-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.