Analogue, Mixed Signal, LSI


Secure authenticator chip

12 June 2013 Analogue, Mixed Signal, LSI

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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