Re: storing an explicit nonce

On Thu, Oct  7, 2021 at 09:38:45PM +0300, Ants Aasma wrote:
> On Wed, 6 Oct 2021 at 23:08, Bruce Momjian <bruce@momjian.us> wrote:
> 
>     Yes, I would prefer we don't use the LSN.  I only mentioned it since
>     Ants Aasma mentioned LSN use above.
> 
> 
> Is there a particular reason why you would prefer not to use LSN? I suggested
> it because in my view having a variable tweak is still better than not having
> it even if we deem the risks of XTS tweak reuse not important for our use case.
> The comment was made under the assumption that requiring wal_log_hints for
> encryption is acceptable.

Well, using the LSN means we have to store the LSN unencrypted, and that
means we have to carve out a 16-byte block on the page that is not
encrypted.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  If only the physical world exists, free will is an illusion.