> ## Documentation Index
> Fetch the complete documentation index at: https://nayax-44d6e37b-docs-marshall-faq-redistribution.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Receive the PIN Block

Nayax will send the encrypted PIN Block in the Authorization/Sale request under the `DukptInfo` object as in the example below:

```json theme={null}
"DukptInfo": {
    "Algorithm": 1,
    "PINBlock": "xxxxxxxx",
    "PINBlockFormat": 48,
    "ExternalKeyId": "372"}
```

Where:

* `Algorithm` = the algorithm used for encryption.
  * `1`:	TDEA
  * `2`: 2TDEA
  * `3`: AES-128
  * `4`: AES-256
  * `5`:	3TDEA
* `PINBlock` = The encrypted PIN Block
* `PINBlockFormat` = The Pin block format used.
  * `1`: ISO\_0
  * `5`: ISO\_1
  * `34`: ISO\_2
  * `47`: ISO\_3
  * `48`: ISO\_4
* `ExternalKeyId` = The external ID of the key used in a Dynamic key exchange format.