OMNIKEY HF MIFARE Easy Module - RFID Webshop

HF MIFARE Easy Module
User Manual, Firmware V1.0
1506-USM-01-0-03
4.4.3.17.1 Writing master keys
Keys are write only. It is not possible to read the keys. Nevertheless the reader returns correct
error messages if the writing process fails.
A verification of the master key can only be done using an appropriate card and a successful
login.
4.4.3.17.2 Using master keys for authentication
Master keys may be used for ISO-14443 A tag authentication. It is possible to use every stored for
key A as well as key B authentication.
Each key is 6 bytes long and stored redundantly for data security.
4.4.3.18 Write value block
This command formats a block as a value block containing a 32-bit value. A read after write is
performed automatically. Value blocks need a complete 16-byte block due to redundant storage. A
successful login is required to run the command.
Command
Command
'wv'
Data
Value block (1 byte)
Value (4 bytes)
Answer
Answer
Data
'I'
'F'
'N'
'U'
Description
Written value (4 bytes)
Error: value block failure
Error: increment failure
Error: No tag in field
Error: Read after write failure
Example
Command Description
wv05010055EF Writes value 010055EFh to block 5.
4.4.3.18.1 Invalid value 'I'
The value read back after the write value instruction is a not a value block. Data was written
corruptly.
4.4.3.18.2 Write failure 'F'
Additional to a data read error caused by bad transmission conditions; this error appears if a
sector is addressed which is not located in the authenticated sector.
4.4.3.18.3 No tag error 'N'
This error is returned if no tag is present or the card does not respond.
November 4, 2008 Page 43 of 63
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