AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

Appendix K. Using Encryption Communication Security

CryptoRF contains security options that can be enabled by the customer at personalization. By default no security is

enabled, allowing CryptoRF to operate as a simple RFID EEPROM memory. Enabling Encryption Communication

Security on a User Zone restricts access to the data to users with knowledge of the Authentication key.

K.1.

Communication Security

Communication between the PICC and reader operates in three security modes. The Normal mode allows

communication of all types of data in the clear. Authentication Communication Security mode encrypts only passwords.

Encryption Communication Security mode encrypts both user data and passwords. The default communication mode is

Normal mode.

Table 92. CryptoRF Communication Security Options.

Communication Mode

User Data

Normal

Clear

Authentication

Clear

Encryption

Encryption

System Data

Clear

Clear

Clear(1)

Passwords

Clear

Encryption

Encryption

Note: 1. 88RF PICCs support an encryption option for programming secrets. See Appendix F.

Encryption Communication Security is activated by performing Mutual Authentication between the Host system and the

PICC using the Verify Crypto command, followed by the Encryption Activation procedure. Once activated, the PICC

will remain in Encryption mode until a security error occurs, a new Verify Crypto command is received, RF power is

removed, or a DESELECT command or IDLE command is received.

K.2.

Encryption Security Options [88SC]

Encryption Communication Security for a User Zone is enabled by programming the Access Register (AR) and

Password Register (PR) for the zone. The Communication Security Mode (M) bits [AM1, AM0, ER] of the Access

Register determine the Communication Security requirements for the User Zone. The Password Register determines

which Key Set is used to access the User Zone. Configuration of the AR and PR registers is described in Appendix H.

Table 93. Selecting Encryption using the Communication Security Mode bits of the Access Register.

AM1 AM0 ER

Communication Security Mode

Auth. Key (AK) Pgm-Only Key (POK)

1

1

0 Encryption for Read / Write

Read / Write Access

N/A

1

1

1 No Authentication or Encryption Required

N/A

N/A

Table 93 shows the one CryptoRF Encryption Communication Security option for 88SC PICCs, plus the default setting.

By default M = 111b and no Authentication or Encryption Activation is required to access the user memory.

K.2.1. M = 110b Security – Encryption for Read / Write

When M = 110b Encryption is required for Read or Write access to the User Zone. If Encryption Activation is performed

with the key identified in the AK bits of the Password Register, then Read/Write access is granted to the User Zone. A

checksum is required for write operations.

5276C–RFID–3/09

115

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