DS28E39
DeepCover Secure ECDSA Bidirectional
Authenticator with ChipDNA PUF Protection
Design Resource Overview
Detailed Description
Operation of the DS28E39 involves use of device EEPROM
and execution of device function commands. The following
provides an overview including the decrement counter.
Refer to the DS28E39 Security User Guide for details.
The DS28E39 integrates the Maxim ChipDNA PUF
to protect all device stored data from invasive dis-
covery. Optionally, under user control, the ChipDNA
output can also be used as the ECC-P256 private
key. In addition to the ChipDNA circuit and ECC-P256
engines for signatures, the device integrates a FIPS/
NIST-compliant TRNG, 2Kb EEPROM for user mem-
ory, ECC key set, control registers, and certificates.
One user page can optionally be designated as a
decrement-only counter. The device operates from a
1-Wire interface with external parasitic supply by way of
Memory
A2KbsecuredEEPROMarrayprovidesstorageoptionsfor
an ECDSA key pair and certificate, a decrement counter,
and/or general-purpose, user-programmable memory.
Depending on the memory space, there are either default
or user-programmable options to set protection modes.
an external capacitor (C ). Figure 1 shows the relation-
X
ships between the circuit elements of the DS28E39.
C
X
PARASITE
POWER
CEXT
64-BIT ROM ID
1-WIRE
INFC
&
IO
BUFFER
ECC-P256
CMD
TRNG
2kb E2 ARRAY
USER MEMORY
KEYS & CERTIFICATE
DECREMENT COUNTER
PRIVATE KEY
ChipDNA
DS28E39
Figure 1. Block Diagram
Maxim Integrated
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www.maximintegrated.com