Question

 What checksums does Amazon S3 employ to detect data corruption? Any detailed explanation would be perfect.

I did look into AWS documentation but its explained in a complex way.

Answer 1

Amazon S3 uses a combination of Content-MD5 checksums and cyclic redundancy checks (CRCs) to detect data corruption. Amazon S3 performs these checksums on data at rest and repairs any corruption using redundant data. In addition, the service calculates checksums on all network traffic to detect corruption of data packets when storing or retrieving data.

Hope this helped.

Comments

is checksum performed by default by S3?

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The AWS CLI will perform checksum validation for uploading and downloading files in specific scenarios.

For details refer https://docs.aws.amazon.com/cli/latest/topic/s3-faq.html