AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

J.6.

Key Sets

CryptoRF has four Key Sets. Each Key Set is associated with four registers in the Configuration Memory. The

Authentication Key is stored in the Secret Seed Gi register. The Authentication Attempt Counter for Secret Seed Gi is

stored in the AACi register. The Cryptogram Ci register is used during Authentication Activation procedure to store the

response to the Host challenge. The Session Key Si register is used to store the Encryption Activation key.

Figure 34. Partial Configuration Memory map showing the Key Set Registers.

$0

$1

$2

$3

$4

$5

$6

$7

$50

AAC0

$58

$60

AAC1

$68

$70

AAC2

$78

$80

AAC3

$88

$90

$98

$A0

$A8

Cryptogram C0

Session Encryption Key S0

Cryptogram C1

Session Encryption Key S1

Cryptogram C2

Session Encryption Key S2

Cryptogram C3

Session Encryption Key S3

Secret Seed G0

Secret Seed G1

Secret Seed G2

Secret Seed G3

Cryptography

Secret

Figure 34 shows the portion of the Configuration Memory that contains the Key Set registers. The registers shaded in

green can always be read, but cannot be written after personalization. The registers shaded in blue cannot be written

or read after personalization. Note that all of the Security Fuses must be programmed during personalization for the

device secrets to be secure.

Key Set i uses registers AACi, Ci, Gi and Si. If AACi is locked, the Key Set i is permanently disabled and any User Zone

requiring Key Set i for Authentication or Encryption Activation will no longer be accessible.

J.6.1.

Changing Keys

The Secret Seeds cannot be modified after the Security Fuses are programmed during personalization. The AAC

registers cannot be re-written after the Security Fuses are programmed either. This is true even if the SME option in the

DCR register is enabled.

110 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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