In critical systems, genuine components are the safest and most reliable. Designers can now enhance safety, security, and data integrity for vehicle systems while reducing complexity and code development by authenticating components with Maxim Integrated Products‘ DS28E40 DeepCover automotive secure authenticator.
As the newest addition to Maxim’s line of AEC-Q100 Grade 1 solutions for automotive systems, the DS28E40 is a parasitically powered authenticator that uses a 1-Wire interface for simple connectivity. This authenticator IC ensures that only genuine components are used for many electronic systems — such as advanced driver-assistance systems (ADAS) and electric vehicle batteries.
As cars become more sophisticated, safety and security risks grow as well. Automotive manufacturers use authentication in two ways: to ensure only OEM-certified components are safely connected to vehicle systems and to reduce the growing threat of malware attacks.
However, most full-blown secure microcontrollers have a relatively big footprint and require software development teams to create, test, and debug their code.
But this is the concern with current microcontroller-based solutions: the bigger the code base is, the higher the risk of bugs or malware adversely affecting performance. Plus, I²C and SPI interface automotive security solutions available on the market may require many interface pins (and as many as five or six, including dedicated power and reset lines).
More pins can lead to higher costs and more reliability issues.
The DS28E40 DeepCover authenticator is a fixed-function, 1-Wire solution that meets the AEC-Q100 standard Grade 1 performance standards and replaces microcontroller-based approaches. The fixed-function device gives OEMs a targeted algorithm and command toolset to meet their specific security needs, while reducing system design complexity.
Its public/private key asymmetric ECDSA (ECC-P256 curve) and other key authentication algorithms are built into the IC, allowing OEMs to skip the development of proprietary device-level code. This and other algorithms in the authenticator IC provide the strongest defense against unauthorized components that could compromise performance, safety, and data integrity.
The 1-Wire interface combines power and communication on a single pin and requires only two interconnects including the ground pin. Fewer interconnect pins reduce cost and further improves reliability by enabling smaller cable harnesses to connect an ECU to a remote endpoint.
The DS28E40 comes in a compact, 4mm x 3mm TDFN package and operates over the -40 to +125-degree Celsius temperature range.
- Robust security: Built-in symmetric key secure hash algorithm (SHA-256) support; secure storage of ECDSA and SHA-256 keys; one-time-programmable nonvolatile memory for storage of digital certificates and manufacturing data; hardware-based security stronger than software approach
- Higher reliability: Dedicated function reduces code size; 1-Wire interface reduces interface pins from 6 to 2
- Simple integration: Authentication algorithms built into the IC eliminate the device-level development code efforts. Plus, the 1-wire interface and low software overhead on the host side simplifies the design integration and does not require any external power
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