On 2019-Jul-05, Bruce Momjian wrote:
> On Fri, Jul 5, 2019 at 05:00:42PM -0400, Bruce Momjian wrote:
> > On Fri, Jul 5, 2019 at 04:24:54PM -0400, Alvaro Herrera wrote:
> > > Oh, is that the idea? I was kinda assuming that the data was kept
> > > as-stored in shared buffers, ie. it would be decrypted on access, not on
> > > read from disk. The system seems very prone to leakage if you have it
> > > decrypted in shared memory.
> >
> > Well, the overhead of decrypting on every access will make the slowdown
> > huge, and I don't know what security value that would have. I am not
> > sure what security value TDE itself has, but I think encrypting shared
> > buffer contents has even less.
>
> Sorry I didn't answer your question directly. Since the shared buffers
> are in memory, if the decryption key is also unlocked in memory, there
> isn't much value to encrypting shared buffers, and the overhead would be
> huge.
Oh, I get your point now.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
