IDTech VP3350

The IDTech VP3350 delivers magnetic stripe reader (MSR), Europay, MasterCard and Visa (EMV), and NFC (contactless) payment acceptance with SRED security and reliability. The VP3350 is a mobile device and supports Smart MSR, Chip, and Contactless transactions. The device is PCI Secure Reading and Exchange of Data (SRED) certified and supports all contactless payment methods. The payload data is Derived Unique Key Per Transaction (DUKPT) encrypted and hex encoded.

Outputs from the device can be parsed using IDTech's parser tool:

https://www.idtechproducts.com/hosted-files/tools/parsomatic.html

Swiped Payloads

When a card is swiped on the VP3350 device, the track data is encrypted in separate data blocks. Below is a sample output from the machine.

In this sample payload, the tag that contains the track data is dfee23.

Sample Payload:

The result after decoding the track data will be

This data is parsed as follows

The encrypted track data, KSN, and serial number are sent to Decryptx to be decrypted. This example payload is decoded to the following

[{"name":"value0","value":"%B4761731000000043^UAT USA/TEST CARD 02 ^2412201114380440000000000000000?O\u0000"}]

EMV Data

Transaction data from chip-card interactions (EMV data) is returned primarily as tag-length-value (TLV) triplets.

ID Tech transaction data consists of mix industry-standard EMV tags and proprietary ID Tech tags. Tag value is encoded as follows:

• Byte 1: First (and possibly the only) value of the tag. If the bottom 5 bits are ON, then next byte is also part of the tag. In other words:
  (1stByte & 0x1F == 0x1F) // TRUE means more tag bytes follow
• Byte 2..n (if necessary): If the most significant bit is ON, then next byte is also part of the tag. In other words:
  (Byte & 0x80 == 0x80) // TRUE means more tag bytes follow

The top bits of the tag length byte have special meaning:

• If the most significant bit of the length byte is OFF, then byte represent the byte length of data to follow. Otherwise, if the bit is ON, then the lower nibble specifies how many following bytes specifies the length of the data to follow. For example, if the length byte is 84, the most significant bit is 1, the lower nibble is 4. Thus, the number of data length bytes is 4.
• If bit 7 is set, bits 5 and 6 of the tag length byte are used in a special way:
  • Bit 6 will be set, if data is encrypted.
  • Bit 5 will be set, if data is masked (i.e. track data)

The following table lists IDTech proprietary tags for encrypted and/or masked data:

IDTech's parser tool also has a section to look up and confirm tag information.

Example

The EMV payloads from this device do not provide the full serial number as required to decrypt them. The device serial can be obtained by running the command 12-01 prior to capturing the payload.

Once the sample payload is decrypted through Decryptx, the response is

{"success":true,"messageId":"1202311221504111013149689","decrypted":[{"name":"value0","value":"57134761731000000043d24122011303130600000f000000"}]}

Contactless Data

Example

When the sample payload is decrypted through Decryptx, the response is

{"success":true,"messageId":"1202311221527361031935599","decrypted":[{"name":"value0","value":"57135413330089604111d25122010123409172029f000000"}]}