How are other companies handling the new NACHA bank account storage requirements?

Summary:

Need a way to encrypt banking information in an attachment within the Oracle ERP AP module to satisfy a NACHA requirement

Content (required):

Per NACHA's new requirements, bank account numbers must now be rendered unreadable when "at rest" in storage. To be compliant, we wish to learn how other Oracle customers utilize at rest encryption for bank account information. In other words, when no authorized employee is accessing this information, we wish to make it unreadable to meet NACHA's data security standards. If any company has received confirmation from NACHA/Oracle that these actions suffice, please give confirmation and provide any possible details/ best practices for compliance. Thank you.