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: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Stephen Frost <sfrost@snowman.net>, Ryan Lambert <ryan@rustprooflabs.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: 2019-07-10T20:08:40Z
Lists: pgsql-hackers

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  1. Revamp the WAL record format.

On Wed, Jul 10, 2019 at 03:53:55PM -0400, Alvaro Herrera wrote:
> On 2019-Jul-10, Bruce Momjian wrote:
> 
> > Good, so I think we all now agree we have to put the nonce
> > (pg_class.oid, LSN, page-number) though the cipher using the secret.
> 
> Actually, why do you need the page number in the nonce?  The LSN already
> distinguishes pages -- you can't have two pages with the same LSN, can
> you?  (I do think you can have multiple writes of the same page with
> different LSNs, if you change hint bits and don't write WAL about it,
> but maybe we should force CRC enabled in encrypted tables, which I think
> closes this hole?)

Uh, what if a transaction modifies page 0 and page 1 of the same table
--- don't those pages have the same LSN.

-- 
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

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