The enable_audit setting
If the ENABLE_ROW_SECURITY setting is false, this setting is treated as though it is false. So if row security is disabled, audit is implicitly disabled.
If row security is enabled, audit can be enabled or disabled.
When ENABLE_ROW_SECURITY is true and ENABLE_AUDIT is true, then you can create audit configurations with digital signing keys. In addition, you can create keystores that contain keys for digital signing.