S3용 체크섬 알고리즘 추가하기 [AHSS 스터디 1주차]

https://aws.amazon.com/ko/blogs/storage/enabling-and-validating-additional-checksums-on-existing-objects-in-amazon-s3/ Enabling and validating additional checksums on existing objects in Amazon S3 | Amazon Web ServicesVerifying data integrity during a data migration or data transfer is a data durability best practice that ensures your data is error-free and not corrupt as it reaches its destinat..