You are employed at a financial institution that facilitates online registration for its customers. As part of this registration process, new customer data is sent to Google Pub/Sub before being ingested into Google BigQuery for storage and analysis. Considering the need for enhanced security, you have decided to redact the Government Issued Identification Numbers (GIIN) of the customers in your database. However, it is essential to allow customer service representatives access to the original GIIN values when necessary. What steps should you take to ensure this?