AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation
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AT88RF04C-MY1G Datasheet PDF : 158 Pages
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K.5.
The Key Register [88RF]
The Key Registers are used to select the Key Sets for Authentication or Encryption Communication Security on 88RF
PICCs. Any Key Set can be used with any User Zone by programming the Key Register for the User Zone with the
appropriate PK and ROK values. One Key Set can be used with any number of User Zones.
Figure 37. Definition of the Key Registers on 88RF PICCs.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
PK1 PK2 ROK1 ROK2 RFU PW2 PW1
1
1
1
1
1
1
1
Bit 0
PW0
1
Default Value
The Primary Key Set selection bits control the key set assigned to a User Zone for communication security. The
Access Register M bits determine the Communication Security mode associated with the PK bits.
Table 97.
PK1
0
0
1
1
Coding of the Primary Key Set select bits for CryptoRF communication security.
PK2
Authentication Key
Encryption Key
0
Secret Seed G0
Session Key S0
1
Secret Seed G1
Session Key S1
0
Secret Seed G2
Session Key S2
1
Secret Seed G3
Session Key S3
The Read-Only Key Set selection bits control the key set assigned to a User Zone for communication security. The
Access Register M bits determine the Communication Security mode associated with the ROK bits. For some
Communication Security modes the ROK register bits are not used.
Table 98. Coding of the Read-Only Key Set select bits for CryptoRF communication security.
ROK1
ROK2
Authentication Key
Encryption Key
0
0
Secret Seed G0
Session Key S0
0
1
Secret Seed G1
Session Key S1
1
0
Secret Seed G2
Session Key S2
1
1
Secret Seed G3
Session Key S3
118 AT88SC0808/1616/3216/6416CRF, AT88RF04C
5276C–RFID–3/09
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