ATECC108 from ATMEL
ATECC108 is a ECDSA Crypto Authentication Chip that is using key sizes of 256 or 283 bits and supports I²C communication (< 1Mb/sec) and Single-Wire Interface. Features: NIST B283/K283/P256 bit …
Maxim’s ECDSA Demo Stick
Maxim’s ECDSA DS28E35 + DS 2475 A duo that brings a ECDSA to 1-wire http://www.maximintegrated.com/en/products/embedded-security/authenticators/advisor/asymmetric.cfm Quick info links: Deterministic Usage of the Digital Signature Algorithm (DSA) and Elliptic Curve Digital …