> For the complete documentation index, see [llms.txt](https://docs.onum.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.onum.com/pipelines/actions/transformation/field-transformation/field-transformation-operations/hashing/md4.md).

# MD4

## Description

This operation allows you to hash data using the **MD4 (Message Digest 4)** algorithm. MD4 is a cryptographic hash function primarily intended for use in systems based on 32-bit computers. It produces a 128-bit hash value (16 bytes), typically represented as a 32-character hexadecimal string.

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## Data types

These are the input/output expected data types for this operation:

### Input data

`String` - Data you want to hash.

### Output data <a href="#output-data" id="output-data"></a>

`String` - MD4 hash values.

***

## Example

Suppose you want to **hash** your input strings using the **MD4** algorithm:

1. In your Pipeline, open the required [Action](https://onum.gitbook.io/onum-docs/the-workspace/pipelines/actions) configuration and select the input **Field**.
2. In the **Operation** field, choose **MD4**.
3. Give your **Output field** a name and click **Save**. The strings in your input field will be hashed using the MD4 algorithm.

For example, the following string:

```csv
Hello World!
```

will be hashed as:

```json
b2a5cc34fc21a764ae2fad94d56fadf6
```

{% hint style="info" %}
You can try out operations with specific values using the **Input** field above the operation. You can enter the value in the example above and check the result in the **Output** field.
{% endhint %}