Prefix to be used when representing the options in internal format that should be encrypted when writing them out.
For example: If the value of the property CSI.LoginModule.0.options.options1 is to be encrypted, then the provider options should contain CSI.LoginModule.0.options.options1=valueToBeEncrypted CSI.LoginModule.0.encryptedOptions.options1=true
The configuration providers should follow this when they encounter options when reading in the configuration file that are encrypted and encrypt the options when they are written out.