Sulat.com / Writing on AITuesday, November 10, 2026
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Cloud Security/5 January 2023

Amazon S3 makes upload encryption automatic

Existing objects are not retroactively encrypted.

At a glance

  • New uploads are encrypted at rest.

Amazon S3 now encrypts every new object upload by default. Announced on 5 January, the change applies across AWS Regions, including China and GovCloud. AWS says the baseline adds no charge or performance penalty.

Buckets without a configured default now use S3-managed server-side encryption. Existing encryption settings stay intact. Existing objects are not retroactively encrypted, and server-side protection at rest is not end-to-end encryption.

The change removes an opt-in step from storage security. CloudTrail data-event logs can show automatic encryption; console and other reporting updates are expected over the coming weeks. Data-event logging costs extra.

New uploads versus existing objects.
Original diagram: Sulat.

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