Hash Collision percentage on HASHBYTES SHA2_512

asked 2020-08-27T07:20:17.623+00:00
Larimore Suanque 41 Reputation points

Hello, we are trying to move a large table and want to confirm the varbinary values do not change (or at least capture it if it changes). We plan to use below query:

select ID, HASHBYTES('SHA2_512', cast(blob AS VARBINARY(8000))) from BlobTable;

I understand it is possible to have the same hashvalue even for different inputs in hash collision.

Would Microsoft know what is the percentage this could happen?

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  1. answered 2020-08-27T07:52:51.537+00:00
    MelissaMa-MSFT 24,116 Reputation points

    Hi @Larimore Suanque

    Please refer below links and check whether they are helpful to you. Thanks.

    Choosing the right algorithm in HashBytes function
    Hash Collision Probabilities

    If the response is helpful, please click "Accept Answer" and upvote it.

    Best regards

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