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A business maintains its business-critical customer data on an on-premises system in an encrypted format. Over the years, the business has moved from using a single encryption key to multiple encryption keys by dividing the data into logical chunks. With the decision to move all data to the Amazon S3 bucket, the business is looking for a technique to encrypt each file with a different encryption key to provide maximum security to the migrated on-premises data. How will you implement this requirement without adding the overhead of splitting the data into logical groups?