> For the complete documentation index, see [llms.txt](https://docs.tonic.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tonic.ai/app/admin/on-premise-deployment/setting-up-a-secret.md).

# Setting up a secret

Tonic Structural stores and encrypts your database credentials.

To use your own encryption key, during initial installation, add the environment setting `TONIC_SECRET` to both the Structural worker and Structural web server containers.

`TONIC_SECRET` must have the same value in both containers. It can be any string.

`TONIC_SECRET` is encrypted using AES. The encryption uses a 128-bit key.


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