> For the complete documentation index, see [llms.txt](https://docs.n8n.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.n8n.io/integrations/builtin/credentials/crypto.md).

# Crypto credentials

You can use these credentials to authenticate the following nodes:

* [Crypto](/integrations/builtin/core-nodes/n8n-nodes-base.crypto.md)

## Credential fields

Configure only the fields the action you're using needs. All fields are optional.

* **Hmac Secret**: The secret used by the **Hmac** action.
* **Private Key**: The private key used by the **Sign** action.
* **Encryption Passphrase**: The passphrase used by the **Encrypt** and **Decrypt** actions in symmetric mode. Use 16 or more random characters, or a strong passphrase generated by a password manager.
* **Encryption Public Key**: The RSA public key (PEM, SPKI format) used by the **Encrypt** action in asymmetric mode.
* **Encryption Private Key**: The RSA private key (PEM, PKCS#8 format) used by the **Decrypt** action in asymmetric mode.

## Related resources

Refer to the [Crypto node documentation](/integrations/builtin/core-nodes/n8n-nodes-base.crypto.md) for details on each action.