Advanced Custom Fields Encrypt Field Option

Adds an option to encrypt text field values upon save. Useful for storing sensitive data, such as API keys.

Requirements

Download and unzip plugin direcrtory inside of wp-content/plugins and activate plugin

Define the ACF_EFO_SECRET_KEY constant inside of wp-config.php

/** ACF Encrypt Field Option Key */
define('ACF_EFO_SECRET_KEY', 'your key here');