Horton

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

Bruce Momjian <bruce@momjian.us>

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From: Bruce Momjian <bruce@momjian.us>
To: Nico Williams <nico@cryptonector.com>
Cc: Joe Conway <mail@joeconway.com>, Tom Lane <tgl@sss.pgh.pa.us>, Robert Haas <robertmhaas@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>, "Moon, Insung" <Moon_Insung_i3@lab.ntt.co.jp>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2018-06-21T15:56:39Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Revamp the WAL record format.

On Wed, Jun 20, 2018 at 05:28:43PM -0500, Nico Williams wrote:
> On Wed, Jun 20, 2018 at 06:19:40PM -0400, Joe Conway wrote:
> > On 06/20/2018 05:12 PM, Bruce Momjian wrote:
> > > On Mon, Jun 18, 2018 at 11:06:20AM -0400, Joe Conway wrote:
> > > Even if they are encrypted with the same key, they use different
> > > initialization vectors that are stored inside the encrypted payload, so
> > > you really can't identify much except the length, as Robert stated.
> 
> Definitely use different IVs, and don't reuse them (or use cipher modes
> where IV reuse is not fatal).
> 
> > The more you encrypt with a single key, the more fuel you give to the
> > person trying to solve for the key with cryptanalysis.
> 
> With modern 128-bit block ciphers in modern cipher modes you'd have to
> encrypt enough data to make this not a problem.  On the other hand,
> you'll still have other reasons to do key rotation.  Key rotation
> ultimately means re-encrypting everything.  Getting all of this right is
> very difficult.
> 
> So again, what's the threat model?  Because if it's sysadmins/DBAs
> you're afraid of, there are better things to do.

Agreed.  Databases just don't match to the typical cryptographic
solutions and threat models.

-- 
  Bruce Momjian  <bruce@momjian.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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