On Fri, Mar 20, 2020 at 12:50:27AM +0900, Masahiko Sawada wrote:
> On Fri, Mar 20, 2020 at 0:35 Bruce Momjian <br...@momjian.us> wrote:
>     Well, the issue is if the user can control the user key, there is might be
>     a way to make the user key do nothing.
> 
> Well I meant ‘USER_KEY:’ is a fixed length string for the key used for wrap 
> and
> unwrap SQL interface functions. So user cannot control it. We will have 
> another
> key derived by, for example, HKDF(MK, ‘TDE_KEY:’ || system_identifier) for
> block encryption.

OK, yes, something liek that might make sense.

-- 
  Bruce Momjian  <br...@momjian.us>        https://momjian.us
  EnterpriseDB                             https://enterprisedb.com

+ As you are, so once was I.  As I am, so you will be. +
+                      Ancient Roman grave inscription +


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