Securely Load Bank Account information to S4 HANA Cloud

We have a question regarding secured way to mass load Vendor Bank Account details to S/4 HANA Cloud.

We are migrating vendor master data from legacy to S4 HANA Cloud as part of the Business transformation journey. We are using S4 HANA Migration cockpit (Upload templates) for data migration of Master and Transactional data.

One of the key data for vendor master is Bank Account information. We are looking for available options to securely transfer this information from the legacy to S/4 HANA Cloud. Key requirement from customer is to have this information encrypted while the data is at rest as well as during the transfer.