# Custom value processors

Some data values require custom processing before or after the generator is applied.

If you require custom processing for data values, Tonic.ai can work with you to develop and deploy custom value processors for your Tonic Structural instance.

After a custom value processor is deployed, you can select the processor as part of the generator configuration for each column. The custom value processor option is in the advanced settings section of the column configuration panel.

<figure><img src="/files/Eac2EenIFLsZwtIWhPf1" alt=""><figcaption><p>Custom value processor dropdown on a generator configuration panel</p></figcaption></figure>

One common use case for custom processing is to decrypt source data before applying a generator, and encrypt destination data before writing it to the destination database.

Structural data encryption allows you to set up decryption and encryption to apply to columns. For more information, go to [Configuring and using Structural data encryption](/app/generation/generators-assign-config/generators-data-encryption-config.md).


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