| From: | Stephen Frost <sfrost(at)snowman(dot)net> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Ryan Lambert <ryan(at)rustprooflabs(dot)com>, Joe Conway <mail(at)joeconway(dot)com>, Antonin Houska <ah(at)cybertec(dot)at>, 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 19:56:23 |
| Message-ID: | 20190710195623.GV29202@tamriel.snowman.net |
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| Lists: | pgsql-hackers |
Greetings,
* Alvaro Herrera (alvherre(at)2ndquadrant(dot)com) 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?)
The point about the LSN not changing is definitely a very good one.. I
agree that we should require checksums to deal with that possibility.
Thanks,
Stephen
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