ATECC508A datasheet(7/109 Pages) MICROCHIP

7 / 109 page

Introduction

1.1

Applications

The ATECC508A device is a member of the Microchip CryptoAuthentication™ family of crypto engine

authentication devices with highly secure hardware-based key storage.

The ATECC508A device has a flexible command set that allows use in many applications, including the

following:

•

Network/IoT Node Protection - Authenticates node IDs, ensures the integrity of messages, and

supports key agreement to create session keys for message encryption.

•

Anti-Counterfeiting - Validates that a removable, replaceable, or consumable client is authentic.

Examples of clients could be system accessories, electronic daughter cards, or other spare parts. It

can also be used to validate a software/firmware module or memory storage element.

•

Protecting Firmware or Media - Validates code stored in flash memory at boot to prevent

unauthorized modifications, encrypt downloaded program files as a common broadcast, or uniquely

encrypt code images to be usable on a single system only.

•

Storing Secure Data - Stores secret keys for use by crypto accelerators in standard

microprocessors. Programmable protection is available using encrypted/authenticated reads and

writes.

•

Checking User Password - Validates user-entered passwords without letting the expected value

become known, maps memorable passwords to a random number, and securely exchanges

password values with remote systems.

1.2

Device Features

The ATECC508A includes an EEPROM array which can be used for storage of up to 16 keys, certificates,

miscellaneous read/write, read-only or secret data, consumption logging, and security configurations.

Access to the various sections of memory can be restricted in a variety of ways and then the

configuration can be locked to prevent changes.

The ATECC508A features a wide array of defense mechanisms specifically designed to prevent physical

attacks on the device itself, or logical attacks on the data transmitted between the device and the

system(See Section Security Features). Hardware restrictions on the ways in which keys are used or

generated provide further defense against certain styles of attack(see Section Key Uses and

Restrictions).

Access to the device is made through a standard I2C Interface at speeds of up to 1 Mb/s(see Section I2C

Interface). The interface is compatible with standard Serial EEPROM I2C interface specifications. The

device also supports a Single-Wire Interface (SWI), which can reduce the number of GPIOs required on

the system processor, and/or reduce the number of pins on connectors(see Section Single-Wire

Interface). If the Single-Wire Interface is enabled, the remaining pin is available for use as a GPIO, an

authenticated output or tamper input(see Section General Purpose I/O Pin).

Using either the I2C or Single-Wire Interface, multiple ATECC508A devices can share the same bus,

which saves processor GPIO usage in systems with multiple clients such as different color ink tanks or

multiple spare parts, for example. See Sections Sharing the Interface and Pause Command for more

details regarding Single-Wire Interface implementation.

ATECC508A

Introduction

Datasheet Complete

DS20005927A-page 7

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