> ## Documentation Index
> Fetch the complete documentation index at: https://docs.futurex.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Data-at-rest encryption and Rapid Data Locking (RDL)

> Explains how data-at-rest encryption and RDL work together on FlashArray.

To understand how the Rapid Data Locking (RDL) feature fits in, it helps to know how Data-At-Rest Encryption works on the Pure Storage FlashArray device. For information about Data-At-Rest Encryption, refer to the `wp-flasharray-data-security-and-compliance.pdf` document, which is contained in the Pure Storage FlashArray folder on SharePoint.

## Rapid Data Locking (RDL)

Some environments require external key management to lock down a forward-deployed array. The Pure Storage FlashArray KMIP RDL solution enables you to use the KMES Series 3 for this purpose.

## KMIP RDL

With KMIP RDL, a secondary user-controllable key is introduced, enabling you to unlock the array flash modules. The KMIP keys are remotely accessed from a KMIP server, such as KMES Series 3. Without access to the server, the flash modules cannot be unlocked on power-on.

<Note>
  You can enable RDL during installation or at any time thereafter, and it remains enabled permanently. It applies to all of the array SSDs, including those added afterward.
</Note>