Maxim’s DeepCover embedded security solutions cloak sensitive data under multiple layers of advanced physical security to provide the most secure key storage possible. The new DS28EL22 secure authenticator 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 2 Kb user-programmable EEPROM array provides non-volatile storage of application data and additional protected memory holds a read-protected 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 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 DS28EL22. Slave-to-host authentication is used by a host system to securely validate that an attached or embedded DS28EL22 is authentic. Host-to-slave authentication is used to protect DS28EL22 user memory from being modified by a non-authentic host.
The SHA-256 message authentication code (MAC) which the DS28EL22 generates is computed from data in the user memory, an on-chip secret, a host random challenge and the 64-bit ROM ID. The DS28EL22 communicates over the single-contact 1-Wire bus at overdrive speed.
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