User's Manual

PIN Pad 791 Programmer’s Manual (PCI POS-A) UDN PM0103-U Rev. 06

Section 9 – Online transaction messages with Master / Session keys 2015-04-20

Page202

Uniform Industrial Corp. Proprietary and Confidential Total 342 pages

Single length

PP791 DES decrypts L-key and

R-key of [session key] value, using

active master key.

PIN blocks are TDES encrypted by

session key.

PP791 DES decrypts [session key]

value, using active master key.

PIN blocks are DES encrypted by

session key.

Message element:

Field Length

Value and description

70 2 Message ID

. 1 <2E>, delimiter

[Account] 8..19 Card account number

<FS> 1 <1C>, field separator

[session key] 16 or

Working key encrypted using selected master

key. 32-characters session key produces TDES

encrypted PIN block with EDE order.

Format: hexadecimal string.

This filed should be all zeros if the selected key

is with usage “P0”

[Amount] 4..8 Amount of goods to be displayed on PIN pad.

<FS> 1 (optional) <1C>, field separator

[timeout] 1 (optional) ASCII character from ‘1’ to ‘9’ which

is the timeout value in the unit of 30 seconds.

Default = 9x30 = 270 seconds.

[LRC] 1 Checksum