| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Joe Conway <mail(at)joeconway(dot)com> |
| Cc: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Antonin Houska <ah(at)cybertec(dot)at>, 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: | 2019-07-08 15:25:10 |
| Message-ID: | 20190708152510.hliabu5rtrrmrzrz@momjian.us |
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| Lists: | pgsql-hackers |
On Mon, Jul 8, 2019 at 11:18:01AM -0400, Joe Conway wrote:
> On 7/8/19 10:19 AM, Bruce Momjian wrote:
> > When people are asking for multiple keys (not just for key rotation),
> > they are asking to have multiple keys that can be supplied by users only
> > when they need to access the data. Yes, the keys are always in the
> > datbase, but the feature request is that they are only unlocked when the
> > user needs to access the data. Obviously, that will not work for
> > autovacuum when the encryption is at the block level.
>
> > If the key is always unlocked, there is questionable security value of
> > having multiple keys, beyond key rotation.
>
> That is not true. Having multiple keys also allows you to reduce the
> amount of data encrypted with a single key, which is desirable because:
>
> 1. It makes cryptanalysis more difficult
> 2. Puts less data at risk if someone gets "lucky" in doing brute force
What systems use multiple keys like that? I know of no website that
does that. Your arguments seem hypothetical. What is your goal here?
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ As you are, so once was I. As I am, so you will be. +
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