md5 checksum verification default or configured setting

[ldonohue]

Hello,

Is the md5 checksum verification when Syncovery transfers files to Amazon S3 done by default or is that a setting that needs to be configured?

Thanks!

[tobias]

Hello,
the MD5 checksums are verified automatically, without any special setting.

An exception is if server side encryption is enabled. In that case, the MD5s cannot be compared because the S3 API returns MD5s for the encrypted files.

Also, for large files uploaded in chunks, the MD5 is verified for each chunk but not for the whole file.

[ldonohue]

Hi again,

According to the AWS documentation, server side encryption (SSE) is enabled by default. https://docs.aws.amazon.com/AmazonS3/la ... ption.html Does this mean we should be seeing warnings or errors in the Syncovery logs that the md5 checksum is failing?

Thanks!

[tobias]

Hello,
no, if server side encryption is enabled, then MD5 checks are not used. File integrity is then ensured only by the HTTPS protocol (which is very safe actually).