Re: [Proposal] Table-level Transparent Data Encryption (TDE) and KeyManagement Service (KMS)

On Tue, Jul 09, 2019 at 05:06:45PM -0400, Alvaro Herrera wrote:
>On 2019-Jul-09, Joe Conway wrote:
>
>> > Ot you could just encrypt them with a different key, and you would not
>> > need to make database OID part of the nonce.
>>
>> Yeah that was pretty much exactly what I was trying to say above ;-)
>
>So you need to decrypt each file and encrypt again when doing CREATE
>DATABASE?
>

The question is whether we actually need to do that? Do we change OIDs
of relations when creating the database? If not, we don't need to
re-encrypt because having copies of the same block encrypted with the
same nonce is not an issue (just like copying encrypted files is not an
issue).

Of course, we may need a CREATE DATABASE option that would force
re-encryption with a different key, but it's not necessary because of
nonces or whatnot.

regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
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