A method for transforming an original message into a final message by including an untrusted service, includes the steps of identifying at least one sensitive term from the original message; replacing the at least one sensitive term with a standard token to create a sanitized message; storing the at least one sensitive term; transmitting the sanitized message to a provider of the untrusted service; performing the untrusted service on the sanitized message to create a serviced message; merging the serviced message with the at least one sensitive term stored in the storing step to create the final message.