ATECC608A datasheet(13/81 Pages) MICROCHIP

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Slot

Use Case

Description

Primary Configuration

13 Repersonalization

key

Diversified key that is used to derive

a new set of NwkKey/AppKey parent

keys (Slot 0). It can also be used as

the encrypted write key for itself (Slot

13).

Never read, encrypted write.

Repersonalization key is the write key.

14 IO protection key

Used to encrypt the output of the

KDF command to encrypt newly

derived keys back to the host. It can

also be used as the encrypted read

key for all session keys.

Never readable, always writable, lockable.

ReqRand is set.

15 Reserved

2.2.4

ATECC608A-TNGLoRaWAN Detailed Slot Access Policies

The following tables provide a more detailed description of each slot key and slot configuration information along with

what commands and command modes can be run using this slot.

Table 2-6. Slot 0 Configuration Information

Slot

Configuration Value

Description of Enabled Features

Key:

NwkKey/AppKey(1,2)

• 128-bit AES diversified network parent key

• 128-bit AES diversified application parent key

• Writes by KDF command are not permitted

Slot:

• Derive key allowed with authorizing MAC

• Key stored in Slot 13 used for key derivation

• Contents of the slot are secret and cannot be read.

Valid commands

• DeriveKey command

• KDF AES command source key for generating other derived keys

Table 2-7. Slot 1 Configuration Information

Slot

Configuration Value

Description of Enabled Features

Key:

Device Private Key

• Slot contains the P256 NIST ECC private key

• A public version the of key can always be generated

Slot:

• Key generation is never permitted

• Contents of this slot are secret

• ECDH operations are permitted

• External signature of arbitrary messages is enabled

Valid commands

• GenKey - Public Key Generation

• GenKey - PublicKey Digest Generation

• Sign - External Message

ATECC608A-TNGLoRaWAN

EEPROM Memory and Data Zone Access Policies

Complete Datasheet

DS40002154B-page 13

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