DS2476 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – DeepCover Secure Coprocessor

DS2476
ABRIDGED DATA SHEET
EVALUATION KIT AVAILABLE
DeepCover Secure Coprocessor
General Description
The DS2476 is a secure ECDSA and HMAC SHA-256
coprocessor companion to the DS28C36. The copro-
cessor can compute any required HMACs or ECDSA
signatures to do any operation on the DS28C36. The
DS2476 provides a core set of cryptographic tools derived
from integrated asymmetric (ECC-P256) and symmetric
(SHA-256) security functions. In addition to the security
services provided by the hardware implemented crypto
engines, the device integrates a FIPS/NIST true random
number generator (RNG), 8Kb of secured EEPROM, a
decrement-only counter, two pins of configurable GPIO,
and a unique 64-bit ROM identification number (ROM ID).
The ECC public/private key capabilities operate from
the NIST defined P-256 curve and include FIPS 186
compliant ECDSA signature generation and verification
to support a bidirectional asymmetric key authentication
model. The SHA-256 secret-key capabilities are compli-
ant with FIPS 180 and are flexibly used either in conjunc-
tion with ECDSA operations or independently for multiple
HMAC functions.
Two GPIO pins can be independently operated under
command control and include configurability supporting
authenticated and nonauthenticated operation including
an ECDSA-based crypto-robust mode to support secure-
boot of a host processor. This secure boot method can
also be used to enable the coprocessor functions.
DeepCover embedded security solutions cloak sensitive
data under multiple layers of advanced security to provide
the most secure key storage possible. To protect against
device-level security attacks, invasive and noninvasive
countermeasures are implemented including active die
shield, encrypted storage of keys, and algorithmic methods.
Applications
●● IoT Node Crypto-Protection
●● Accessory and Peripheral Secure Authentication
●● Secure Storage of Cryptographic Keys for a Host
Controller
●● Secure Boot or Download of Firmware and/or System
Parameters
Benefits and Features
●● ECC-256 Compute Engine
• FIPS 186 ECDSA P256 Signature and Verification
• ECDH Key Exchange with Authentication Prevents
Man-in-the-Middle Attacks
• ECDSA Authenticated R/W of Configurable
Memory
●● FIPS 180 SHA-256 Compute Engine
• HMAC
●● SHA-256 OTP (One-Time Pad) Encrypted R/W of
Configurable Memory Through ECDH Established Key
●● Two GPIO Pins with Optional Authentication Control
• Open-Drain, 4mA/0.4V
• Optional SHA-256 or ECDSA Authenticated On/Off
and State Read
• Optional ECDSA Certificate to Set On/Off after
Multiblock Hash for Secure Boot
●● RNG with NIST SP 800-90B Compliant Entropy
Source with Function to Read Out
●● Optional Chip Generated Pr/Pu Key Pairs for ECC
Operations
●● 17-Bit One-Time Settable, Nonvolatile Decrement-
Only Counter with Authenticated Read
●● 8Kbits of EEPROM for User Data, Keys, and
Certificates
●● Unique and Unalterable Factory Programmed 64-Bit
Identification Number (ROM ID)
• Optional Input Data Component to Crypto and Key
Operations
●● I²C Communication, 100kHz and 400kHz
●● Operating Range: 3.3V ±10%, -40°C to +85°C
●● 6-Pin TDFN Package
Ordering Information appears at end of data sheet.
Typical Application Circuit appears at end of data sheet.
19-8589; Rev 0; 7/16