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

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Ryan Lambert <ryan(at)rustprooflabs(dot)com>
Cc: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Joe Conway <mail(at)joeconway(dot)com>, Antonin Houska <ah(at)cybertec(dot)at>, Stephen Frost <sfrost(at)snowman(dot)net>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, "Moon, Insung" <Moon_Insung_i3(at)lab(dot)ntt(dot)co(dot)jp>, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [Proposal] Table-level Transparent Data Encryption (TDE) and Key Management Service (KMS)
Date: 2019-07-10 18:41:44
Message-ID: 20190710184144.7ocp4zs65njd2w6i@momjian.us
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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.

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Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com

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