DS28S60 DeepCover® Cryptographic Coprocessor with ChipDNA™

ADI's DS28S60 DeepCover cryptographic coprocessor easily integrates into embedded systems, enabling confidentiality, authentication, and integrity of information. With a fixed command set and no device-level firmware development required, the DS28S60 makes it fast and easy to implement full security for IoT devices. Communication with the device is performed using the industry-standard SPI secondary interface at up to 20 Mbps with a simple command set that provides a comprehensive security toolbox utilizing hardware-based cryptographic blocks. As a coprocessor to an SPI-interfaced host controller, the command functionality includes ECDSA-P256 signature and verification, SHA-256 based digital signature, AES-128 packet encryption/decryption, ECDHE key exchange for session key generation, and access to high-quality random numbers. A National Institute of Standards and Technology (NIST) SP 800-90B compliant true random number generator (TRNG) is integrated for on-chip cryptographic operations as well as providing random data and nonces to the host controller if required. Nonvolatile storage for secrets, certificates, public/private keys, and application-specific sensitive data is supported with 3.6 KB of secured Flash memory.

The DS28S60 integrates Maxim’s patented ChipDNA feature, a physically unclonable function (PUF), to provide a cost-effective solution with the ultimate protection against security attacks. Using the random variation of semiconductor device characteristics that naturally occur during wafer fabrication, the ChipDNA circuit generates a unique output value that is repeatable over time, temperature, and operating voltage. Attempts to probe or observe ChipDNA operation modify the underlying circuit characteristics, preventing the discovery of the unique value used by the chip's cryptographic functions. ChipDNA output is utilized as key content to secure all device-stored data cryptographically.

The DS28S60EVKIT# evaluation system (EV system) provides the hardware and software necessary to exercise the features of the DS28S60. The EV system consists of five DS28S60Q+ devices in a 12-pin TDFN package, a DS9121EQ+ evaluation TDFN socket board, and a DS9482P# USB-to-I²C/SPI/1-Wire® adapter. The evaluation software runs under Windows® 10, Windows 8, and Windows 7 operating systems, both 64-bit and 32-bit versions. It provides a handy user interface to exercise the features of the DS28S60.