Authenticator IC integrates an ECDSA cryptographic engine
The DS28E35 integrates a FIPS 186-based, Elliptic Curve Digital Signature Algorithm (ECDSA) engine to implement asymmetric (public-key) cryptography to operate a challenge-and-response authentication protocol between a host controller and attached peripherals, sensors, or modules. Operating over a single pin on the 1-Wire interface, the DS28E35 reduces interconnect complexity, simplifies designs, and reduces cost. It provides crypto-strong authentication security for many applications, including medical sensors, industrial programmable logic controller (PLC) modules, and consumer devices.
The use of ECDSA public-key cryptography saves cost and reduces key management complexity by eliminating the need for the host controller to store and protect the authentication key, which is required for comparable symmetric (secret-key) solutions. The DS28E35 operates with a key pair: a public key that resides with the host and an associated private key stored in the DS28E35. As a primary benefit of ECDSA, there is no security requirement to protect the host public key. It is imperative, however, to protect the private key stored in the DS28E35. This is accomplished through Maxim’s DeepCover security technologies, which include advanced die routing and layout techniques, additional proprietary methods for private key protection, and circuits that actively monitor for tampering. The chip comes in a 6-pin TSOC package and a 2x3mm 8-pin TDFN-EP package and is specified over the -40 to +85°C temperature range.
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