The Rambus RT-64x Embedded Hardware Security Module (Root of Trust) family are fully programmable, ISO 26262 ASIL-B hardware security cores offering security by design for automotive applications. They protect against a wide range of failures such as permanent, transient and latent faults and hardware and software attacks with state-of-the-art anti-tamper and security techniques.
As the connected nature of automobiles evolves, device architects face a growing array of emerging security threats. Whether V2X, ADAS, infotainment, or other application, one constant in automotive design is the need for an embedded hardware security module-based security implementation. The Rambus RT-640 is the ideal security co-processor for automotive uses. Built on a custom 32-bit RISC-V siloed and layered secure co-processor, along with dedicated secure memories, the RT-640 features a number of high-capability cryptographic accelerators like AES (all modes), HMAC-SHA-2 (all modes), RSA up to 4096 bits, ECC up to 521 bits, a NIST-compliant Random Bit Generator, and Fast DMA capability.
The RT-640 is certified by TÜV-SGS as ISO-26262 ASIL-B satisfying the ASIL-B Single Point Fault Metric (SPFM ≥ 90 % of faults detected) and Latent Fault Metric (LFM ≥ 60 % of faults detected). The development process for Rambus Root of Trust products is also certified to ISO-26262. To support customers, the RT-640 package comes with the proper ASIL documentation, such as the ASIL-B Failure Modes Effects and Diagnostic Analysis (FMEDA and Safety manuals).
The RT-641 is ASIL-B compliant and builds on the RT-640 with Chinese cipher algorithms SM2, SM3 and SM4, offering security by design for automotive applications that require Chinese crypto-based security support.
If higher SPFM and LFM rates are required, the RT-7xx ASIL-D configuration satisfies the ASIL-D Single Point Fault Metric (SPFM ≥ 99 % of faults detected) and Latent Fault Metric (LFM ≥ 90 % of faults detected). To support customers, the RT-7xx package comes with the proper ASIL documentation, such as the ASIL-D Failure Modes Effects and Diagnostic Analysis (FMEDA), Dependent Failure Analysis (DFA) and Safety manuals.
Satisfying use cases such as secure boot, EVITA and SHE+ HSM and AutoSAR functionality, as well as protection of propriety algorithms, the Rambus RT-64x Root of Trust family is ideally suited for automotive applications where security is imperative.
How the Root of Trust Works
The Rambus Root of Trust RT-640 is an independent hardware security core designed for integration into automotive semiconductor devices, offering secure execution of user applications, tamper detection and protection, and secure storage and handling of keys and security assets. The RT-640 implements hardware and software safety mechanisms to exceed ASIL-B safety integrity levels. It offers chipmakers a siloed approach to security; while located on the same silicon as the main processor, the secure processing core is physically separated. A layered security approach enforces access to crypto modules, memory ranges, I/O pins, and other resources, and assures critical keys are available through hardware only with no access by software. While based on a custom processor, the Rambus Root of Trust supports all common main processor architectures, including ARM, RISC-V, x86 and others.
The Root of Trust supports multi-tenant deployments by offering true multiple root of trust capabilities. Each individual Secure Application can be assigned its own unique keys, meaning permissions and access levels are set completely independent of others. Secure Applications are siloed from each other, ensuring the best approach to security. OEMs can determine access levels and permissions for each and all processes operating within the secure processor.
Secure Applications
Included with the RT-64x Hardware Root of Trust cores are a series of standard secure applications (“containers”) to speed development, including secure boot, identity management, HSM reference, and others. Dedicated EVITA-Full and EVITA-Medium Secure Applications can be offered on request. A container development kit (CSDK) is also included to allow the development of custom containers for specific use cases.
