Specifications

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P25 Development Guide

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The format of the “DATA” is:

FIELD LEN

Byte

DESCRIPTION

Version 1 Specify the data encryption protocol version. It should be

0x02

Key ID (RFU) 1 Specify which key is used to encrypt data. P25 supports only

one key right now. Its value should be 0x00.

Alg ID 1 Specify the type of data encryption and key management

method

0x01 : Fixed DES

0x02 : Fixed 3DES

0x03 : Single DES DUKPT

0x04 : 3DES DUKPT

0x05-0xFF: RFU (Reserved for Future Use)

KSN (optional) 10 Key Serial Number, if DUKPT is applied

Encrypte

d Track1

Data

Length

Encrypte

d Track1

Data

Encrypte

d Track2

Data

Length

Encrypte

d Track2

Data

Encrypte

d Track3

Data

Length

Encrypted

Track

Data

Encrypte

d Track3

Data

The length should be 0 if there is no data in this track.

It is should be in multiple of cipher block size (8 bytes in this

case).

1. The data to be encrypted is the track data(s) in clear text.

2. The track data(s) should be padded to multiple of cipher

block size (8 bytes in this case).

3. The padding string is comprised of bytes equal to the

padding string length ( if data is already multiple of block

size, a new block with all bytes equal to block size needs

to be padded)

Eg.

The data to be encrypted in the example of above section is

45 bytes long (1 cmd+44 track data)

31 30 30 30 39 25 31 48 49 4A 4B 4C 4D 3F 32 30 30 30 39

3B 32 35 36 37 38 39 30 3F 33 30 30 31 31 3B 33 34 34 35

35 36 36 37 38 3F;

3 bytes need to be padded to make it 48 bytes long, the

padding bytes are all ‘03’:

31 30 30 30 39 25 31 48 49 4A 4B 4C 4D 3F 32 30 30 30 39

3B 32 35 36 37 38 39 30 3F 33 30 30 31 31 3B 33 34 34 35

35 36 36 37 38 3F 03 03 03.

If the MSR data is 48 bytes long which is multiple of 8

already, a new block with 8 ‘08’ should be padded:

31 30 30 30 39 25 31 48 49 4A 4B 4C 4D 3F 32 30 30 30 39

3B 32 35 36 37 38 39 30 3F 33 30 30 31 33 3B 33 34 34 35

35 36 36 37 38 39 39 39 39 3F 08 08 08 08 08 08 08 08

Card’s Last 4 Digits

(Optional)

Cardholder’s First and

Last name

(Optional)

Card Expiration Date

(Optional)