IPP MS AND DUKPT COMMUNICATIONS PACKETS
Packet 25: Check the DUKPT Engine
M
X
800 SERIES PROGRAMMERS GUIDE 331
DUKPT Packet 71:
Transfer PIN Block -
(for Packet 76)
Response packet to packet 76, request for PIN. The IPP encrypts the formatted
clear-text PIN block and sends the cipher-text PIN block to the master device.
(refer to the VISA PIN Processing and Data Authentication specification,
International version 1.0)
Packet 71 has a different packet format and meaning than the response PIN block
71 in MS. This is for compatibility with existing third parties (for example, Racal) to
initialize the DUKPT key.
DUKPT Packet 71
Length:
• MAX: 42 characters
• MIN: 6 characters (if NULL entered)
DUKPT Packet 71
Example:
<STX>710[KSN]0123456789123456<ETX>{LRC}
When no errors are detected in packet 76, the IPP returns response packet 71. If
errors are detected in packet 76, response packet 71 is in the following format:
DUKPT Packet 71
Length:
• MAX: 6 characters
• MIN: 6 characters (if NULL entered)
Table 79 DUKPT Packet 71 Format
Data Element Characteristic Comments
<STX> 1H Start of text, value: 02h
Packet Type 2AN Value: 71
Function Key 1N Value: 0, function key indicator feature not
implemented
Key Serial
Number
10-20H Hexadecimal (leading Fs suppressed.);
Included only if PIN entered; length is 0 if no PIN
entered
Encrypted PIN
Block
16H The 64-bit encrypted PIN block represented as
16 hexadecimal digits; length is 0, if no PIN
entered.
<ETX> 1H End of text, value: 03h
{LRC} 1H Error check
Table 80 DUKPT Packet 71 Format: Errors Detected in Packet 76
Data Element Characteristic Comments
<STX> 1H Start of text, value: 02h
Packet Type 2AN Value: 71
Error Code 1N • 1 = no key
• 2 = account error
• 5 = C|D field error
• 6 = PIN pad has over 1 million transactions
<ETX> 1H End of text, value: 03h
{LRC} 1H Error check
To Next Page
Loading...
