P5DF081HN/T1AD2060 NXP Semiconductors, P5DF081HN/T1AD2060 Datasheet - Page 11

• Manufacturer Part Number: P5DF081HN/T1AD2060
• Description: P5DF081HN/HVQFN32/REEL13//T1AD
• Manufacturer: NXP Semiconductors
• Series: MIFARE®r

Specifications of P5DF081HN/T1AD2060

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
P5DF081_SDS
Objective short data sheet
PUBLIC
8.4.6.1 Reference number
8.4.6.2 Limit
8.4.6.3 Key reference number to change the current KUC entry
8.4.6.4 Key version to change the current KUC entry
8.4.6.5 Current value
8.4.5 Key versioning
8.4.6 Key usage counters
8.5.1 General principles for SAM-Host protection
8.5 SAM - Host communication
The MIFARE SAM AV2 reserves three bytes in a key entry to store the version of the three
available keys in the entry. This version byte contains the key version for all kinds of keys
(DES, TDEA, AES and MIFARE). The version information must be included separately in
every key entry of type AES or MIFARE when it is updated by the ChangeKeyEntry
command.
In order to count and limit the number of authentications a key entry can be used for,
MIFARE SAM AV2 stores a table of 16 key usage counter entries, 00h to 0Fh, which are
automatically incremented each time a defined key entry is used for authentication.
Multiple key entries can use the same counter.
The property RefNoKUC codes the reference number of the key usage counter.
RefNoKUC is the index of the entry in the table and can have the value 00h to 0Fh,
therefore 16 key usage counters can be stored.
This field stores the current limit for this key usage counter. It is only possible to use a key
that is linked to this counter for authentication if the current value (see below) is smaller
than the current limit. As soon as the current value is equal to, or higher than, the current
limit, the usage of all key entries linked to this counter is prohibited.
In order to change the KUC, a successful authentication by the host application of the
MIFARE SAM AV2 is necessary. The KeyNoCKUC defines the reference number of the
KST which is used for this.
The 1-byte field holds the key version within the key entry specified to change the KUC
entry. The key version has to be in the range of 00h to FFh. The MIFARE SAM AV2 will
automatically select the appropriate key from one of three positions in the entry that has
the specified version number.
The CurVal field stores the current value of this key usage counter. It is possible to use all
keys referring to this counter for authentication only if the current value is smaller than the
current limit.
MIFARE SAM AV2 supports two different modes: AV1 compatibility mode and MIFARE
SAM AV2 mode. A MIFARE SAM AV2 is initially in MIFARE SAM AV1 compatibility mode.
It can be switched to the MIFARE SAM AV2 by executing a host authentication with the
SAM Master Key using the SAM_LockUnlock command. Note that MIFARE SAM AV2
mode activation is thus only possible if the SAM Master Key is configured as an AES128
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 12 August 2010
191710
P5DF081
MIFARE SAM AV2
© NXP B.V. 2010. All rights reserved.
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