---
title: "Information Supplement: Implementing ISO Format 4 PIN Blocks"
description: The Implementing ISO Format 4 PIN Blocks Information Supplement provides guidance to help PIN acquiring entities with the planning, migration, and testing of the implementation of ISO Format 4 PIN blocks.
image: https://blog.pcisecuritystandards.org/hubfs/2019_Blog%20Images/ISO-PIN-Blocks-4-Supplement.png
---

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# [Information Supplement: Implementing ISO Format 4 PIN Blocks](https://blog.pcisecuritystandards.org/information-supplement-implementing-iso-format-4-pin-blocks)

 Posted by [Lindsay Goodspeed](https://blog.pcisecuritystandards.org/author/lindsay-goodspeed) on 16 Sep, 2021 in [Guidance](https://blog.pcisecuritystandards.org/topic/guidance) and [PIN Security Standard](https://blog.pcisecuritystandards.org/topic/pin-security-standard) and [Information Supplement](https://blog.pcisecuritystandards.org/topic/information-supplement)

![ISO-PIN-Blocks-4-Supplement](https://blog.pcisecuritystandards.org/hs-fs/hubfs/2019_Blog%20Images/ISO-PIN-Blocks-4-Supplement.png?width=800&name=ISO-PIN-Blocks-4-Supplement.png "ISO-PIN-Blocks-4-Supplement")

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The [Implementing ISO Format 4 PIN Blocks Information Supplement](https://www.pcisecuritystandards.org/documents/Implementing_ISO_Format_4_PIN_Blocks_Information_Supplement.pdf) provides guidance to help PIN acquiring entities with the planning, migration, and testing of the implementation of ISO Format 4 PIN blocks in conformance with the requirements in the PCI PIN Standard. This document contains information that may be useful in migrating to the Advanced Encryption Standard (AES).

View this resource for guidance the following questions:

- What are PIN blocks? · What is the ISO Format 4 PIN block?
- Why is migrating to the ISO Format 4 PIN block important?
- What should be considered in a migration plan?
- What reference materials are available to help with the migration?

[![ISO-PIN-4-Supplement-3-1-v2](https://blog.pcisecuritystandards.org/hs-fs/hubfs/2019_Blog%20Images/ISO-PIN-4-Supplement-3-1-v2.jpg?width=600&name=ISO-PIN-4-Supplement-3-1-v2.jpg)](https://www.pcisecuritystandards.org/documents/Implementing_ISO_Format_4_PIN_Blocks_Information_Supplement.pdf)

[![View Implementing ISO Format 4 PIN Blocks Information Supplement](https://no-cache.hubspot.com/cta/default/281302/5c98352a-c1a2-4da2-9ffa-804c78af4365.png)](https://cta-redirect.hubspot.com/cta/redirect/281302/5c98352a-c1a2-4da2-9ffa-804c78af4365)

 

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[ Lindsay Goodspeed ](https://blog.pcisecuritystandards.org/author/lindsay-goodspeed)

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 As Senior Manager, Corporate Communications for the Council, Ms. Goodspeed drives awareness of PCI Security Standards and resources for the protection of payment card data.

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