VeriFone MX800 Series - Page 306

IPP MS AND DUKPT COMMUNICATIONS PACKETS
Common Packets
306 M
X
800 SERIES PROGRAMMERS GUIDE
Key Management Mode
[KMM]
2AH The two digits are concatenated big-
endian, to produce a single control
byte. The key management mode
register (8 bits) in IPP7 is as follows:
Table 45 Packet 18 Format
Data Elements Characteristics Comments
Bit
Description012
000Old single DE
100
Mixed mode (1DES
and 3DES GISKE).
0103DES GISKE MS
110Secure messaging (not
supported in Omni
33XX)
Bit 3 Description
0 1DES DUKPT
1 3DES DUKPT
Bit 4 Description
0 Zero key support off
1 Zero key support on.
Bit 5 Description
0 Zero GISKE session key
support off
1
Zero GISKE session key
support on
Bit 6 Description
0 At least one MS key or KLK
key has been loaded.
1
All MS master keys and the
KLK are clear (no keys
loaded).
Bit 7 Description
0 MAC empty working key
support off.
1
MAC empty working key
support on.