# 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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```

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