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AHAB: Advanced High Assurance Boot, firmware in the processor’s boot ROM that is in charge of authenticating boot images.
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AVB: Android Verified Boot, a version of Verified Boot that works with Project Treble architecture.
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BK: Blob Key, a random 256-bit AES-CCM key that encrypts the data on a CAAM blob.
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BKEK: Blob Key Encryption Key, a 256-bit AES-ECB derived key that encrypts the BK in CAAM blobs.
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CA: Certificate Authority, the entity that issues digital certificates.
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CAAM: Cryptographic Accelerator and Assurance Module, a hardware module on the System-On-Chip which provides hardware-accelerated crypto capabilities.
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CSF: Command Sequence File, a binary blob attached to signed U-Boot images that contains the signatures, certificates, and commands to configure the CAAM for the decryption and authentication processes.
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DEK: Data Encryption Key, secret key used in the encryption of boot artifacts (such as U-Boot, Linux images, device tree blobs and bootscripts).
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dm-verity: Device Mapper verity, a kernel feature that supports transparent integrity checking of block devices.
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HAB: High Assurance Boot, firmware in the processor’s boot ROM that is in charge of authenticating boot images.
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NVTK: Non-Volatile Test Key, a 256-bit key hardwired into the CAAM that is used on open (not secure enabled) devices as a replacement for the OTPMK. The NVTK value is public knowledge and is common to all parts, so its usage is not secure: it should only be used for testing.
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OTP: One-Time Programmable bits, also referred to as electronic fuses or eFuses.
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OTPMK: One-Time Programmable Master Key, a unique 256-bit key stored by the CPU manufacturer on the CPU’s OTP bits and used by the CAAM only on closed (secure boot enabled) devices.
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PKI: Public Key Infrastructure, a set of certificates and private keys that Digi Embedded Yocto uses to sign the firmware images.
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RPMB: Replay Protected Memory Block, a system that stores data to a replay-protected memory area that requires authentication for read and write access.
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RSA: The Rivest-Shamir-Adleman cryptosystem for public-key encryption.
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SRK: Super Root Keys, stored as hashes in the CPU’s OTP bits and used by the HAB for image authentication.
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TA: Trusted Application, an application with special privileges that can perform security-related functions.
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TEE: Trusted Execution Environment, a secure area inside a main processor that protects confidentiality and integrity of loaded code and data. A TEE runs in parallel with the operating system but in an isolated environment.
- Get started
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Digi Embedded Yocto
- Release notes
- Application development
- Yocto system development
- U-Boot bootloader
- Recover your device
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Linux kernel BSP
- Device tree files
- Pin multiplexing (IOMUX)
- ADC
- Audio
- Bluetooth
- Camera
- CAN
- Cellular
- Cryptographic accelerator (CAAM)
- Ethernet
- GPIO
- I2C
- MMC/SD/SDIO
- OTP bits
- PCI Express (PCIe)
- DA9063 Power Management IC
- Power management
- PWM
- Real-Time Clock (RTC)
- SATA
- SPI
- Thermal monitor
- Touch screen
- UART
- USB
- Video
- Watchdog
- Wi-Fi
- XBee socket
- Digi TrustFence for Yocto
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Digi ConnectCore Smart IOmux
- Hardware
- Additional resources
Glossary of cryptography terms
Glossary of cryptography terms:
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