Horton

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

Stephen Frost <sfrost@snowman.net>

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From: Stephen Frost <sfrost@snowman.net>
To: Bruce Momjian <bruce@momjian.us>
Cc: Ryan Lambert <ryan@rustprooflabs.com>, Alvaro Herrera <alvherre@2ndquadrant.com>, Joe Conway <mail@joeconway.com>, Antonin Houska <ah@cybertec.at>, Masahiko Sawada <sawada.mshk@gmail.com>, Tomas Vondra <tomas.vondra@2ndquadrant.com>, Robert Haas <robertmhaas@gmail.com>, Haribabu Kommi <kommi.haribabu@gmail.com>, "Moon, Insung" <Moon_Insung_i3@lab.ntt.co.jp>, Ibrar Ahmed <ibrar.ahmad@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2019-07-10T18:44:30Z
Lists: pgsql-hackers

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  1. Revamp the WAL record format.

Greetings,

* Bruce Momjian (bruce@momjian.us) wrote:
> On Wed, Jul 10, 2019 at 12:38:02PM -0600, Ryan Lambert wrote:
> > 
> >     what is it that gets stored in the page for
> >     decryption use, the nonce or the IV derived from it?
> > 
> > 
> > I believe storing the IV is preferable and still secure per [1]: "The IV need
> > not be secret"
> > 
> > Beyond needing the database oid, if every decrypt function has to regenerate
> > the IV from the nonce that will affect performance.  I don't know how expensive
> > the forward hash is but it won't be free.
> 
> Well, I think we have three options.  We have 3 4-byte integers
> (pg_class.oid, LSN, page-number) that could be concatenated to be the
> IV, we could run those through a hash, or we could run them through the
> encryption function with the secret.

I didn't see where it was said that using a hash was a good idea in this
context..?  Encrypting it with the key looked like it was discussed as a
viable option.  I had understood that part of the point of using the
table OID and page-number was also so that we didn't have to explicitly
store the result, therefore requiring us to need less space on the page
to make this happen.

Thanks,

Stephen