Maxim's DS2477 features a built-in 1-Wire master that integrates FIPS202-compliant SHA-3 challenge and response authentication with Maxim’s ChipDNA feature to provide protection against security attacks.
The DS2477 uses the ChipDNA output as key content to cryptographically secure all device-stored data. Any attempts to probe or observe ChipDNA operation modifies the underlying circuit characteristics, which prevents discovery of the unique value used by the chip cryptographic functions. The ChipDNA circuit, a physically unclonable technology, uses a random variation of semiconductor device characteristics that naturally occur during wafer fabrication. The circuit generates a unique output value that is repeatable over time, temperature, and operating voltage, and provides a core set of cryptographic tools derived from integrated blocks.