Unknown tags when parsing DE 55

[Abdulrahman Ashraf Abu-Hamadi]

Assalamu alaikum

byte[] emvData = ISOUtil.hex2byte("02109f1a0206829f380c9f66049f02069f37045f2a02bf0c089f5a0560068206829f3602010d9f3704cc122c7c5f3401019f120a566973612044656269749f100706011103a020009f1101015f2a0206825f2d046172656e500a56495341204445424954950500000000009f6c02060057114323287973688638d2411201111900250f9f4e1000112233445566778899aabbccddeeff9f6e04207000009f2701809a032301159c01009f2608db24f9744f5aca5d9f02060000000012009f660424804000820220008407a0000000031010870102")

When i try to parse this sample , i found this : 

 
TLVList tlv = new TLVList();

tlv.unpack (emvData);
tlv.dump (System.out, "");

<tlvlist>

   <tag id='2' value='9F1A0206829F380C9F66049F02069F37' />
   <tag id='4' value='2A02BF0C089F5A0560068206829F3602010D9F3704CC122C7C5F3401019F120A566973612044656269749F100706011103A020009F1101015F2A0206825F2D046172656E500A56495341204445424954950500000000009F6C020600571143' />
   <tag id='23' value='7973688638D2411201111900250F9F4E1000112233445566778899AABBCCDDEEFF9F6E0420700000' />
   <tag id='9f27' value='80' />
   <tag id='9a' value='230115' />
   <tag id='9c' value='00' />
   <tag id='9f26' value='DB24F9744F5ACA5D' />
   <tag id='9f02' value='000000001200' />
   <tag id='9f66' value='24804000' />
   <tag id='82' value='2000' />
   <tag id='84' value='A0000000031010' />
   <tag id='87' value='02' />
</tlvlist>

In the switch specifications there is no existence for the first two tags "2 , 4"
The terminal send the icc related data DE55 Encrypted , the switch needs it to be sent Decrypted , when i tries to list the tags of this DE55 sample , i find these two unknown tags , although there are some tags isn` t listed there as i were expecting but after looking carefully i found that the values of the tags iam expecting are part of the two unknown tags


do i need to somehow decode these two unknown tags "2" ,"4" or i need to decode the whole DE55 in another way ?


Thanks in advance

[Souraf Mulla]

Remove first two bytes i.e. 0210 and use remaining data for parsing and you will get proper tags - 

Check this image for the data I have parsed for you - 

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[Abdulrahman Ashraf Abu-Hamadi]

Why we needed to remove the first two bytes 0210 ?

[Mark Salter]

What does the spec you are working to describe the start of this field as?

It might be a length or some form of 'dataset' header, but it looks peripheral to the EMV tlv.

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Mark

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[Abdulrahman Ashraf Abu-Hamadi]

Yes Bro by removing the first two bytes , i got the proper tags 

Thank you so much for your time , help & quick response

[Abdulrahman Ashraf Abu-Hamadi]

But how did you decode it , online TLV decoder or ?

[Abdulrahman Ashraf Abu-Hamadi]

Because when i decoded it using  https://neapa y.com/online-tools/emv-tlv-decoder.html or Manually using JPOS 

I got the Application Label : 56495341204445424954

But i see the value after you decoded it :  V I S A D E B I T.

Any hint

On Saturday, March 4, 2023 at 2:48:00 PM UTC+2 Mark Salter wrote:

[Souraf Mulla]

What you see is in hex/binary format. I shared was ascii representation of that value. 

I used 

https://emvlab.org/tlvutils/ for decoding it. 

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