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Encryption Performance


Encryption Performance

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JohnnyDBA
JohnnyDBA
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I'd like to know if anyone has any statistics for quantifying the impact that encrypting SQL Server communications with signed certificates will impose on a server.

For instance, something like "by enabling encryption all communication will be slowed by x% due to the overhead".

I don't know if this information is available or possible to get, so any help would be appreciated.

Thanks,

John
Jack Corbett
  Jack Corbett
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I don't know of any stats on this, but I have always wondered why encrypt at the SQL Server? This means that the data is now unencrypted on the wire to and from the SQL Server. Why not encrypt/unencrypt in the app? Then your data is protected the whole way.



Jack Corbett

Applications Developer

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Steve Jones
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There are reasons to encrypt in the database, protects data in backups, loss of database, etc. However if it's a big deal, the wire should be encrypted as well. There's less concern of that with internal applications as most networks are switched, it would require a few people to trace the data on the wire, etc.

There's no way to tell what the load will be. The CPU will have to decrypt and encrypt, you have limits on some encryption with data sizes (asymmetric keys), you don't necessarily want to encrypt all data, etc. It requires some testing to determine the load for your application.

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