Horton

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

Jonathan S. Katz <jkatz@postgresql.org>

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From: "Jonathan S. Katz" <jkatz@postgresql.org>
To: Masahiko Sawada <sawada.mshk@gmail.com>, Bruce Momjian <bruce@momjian.us>
Cc: Joe Conway <mail@joeconway.com>, Antonin Houska <ah@cybertec.at>, Stephen Frost <sfrost@snowman.net>, 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: 2019-07-26T02:03:06Z
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.

>>>> Buffer Encryption
>>>> ==============
>>>> We will use AES-CBC for buffer encryption. We will add key id (4byte)
>>>
>>> I think we might want to use CTR for this, and will post after this.
> 
> Not sure if I missed this post or not (as several people mentioned, it
> is easy to get lost in this thread).
> 
> I think what will help drive this decision is whether or not we consider
> the data we are storing on disk as a "file system" in itself. Trying to
> make myself literate in disk encryption theory[1], it seems a big
> weakness in using CTR mode for encryption is we need to be able to
> guarantee a fresh counter for every page we encrypt[2], so if we can
> guarantee the uniqueness of IV per TDEK, this is on the table.
> 
> XTS mode, on the other hand, appears to be more durable to reusing an IV
> as the "tweak" was designed to represent a disk sector, though there are
> still problems. However, I presume this is one of many reasons why
> fscrypt uses XTS[3].

Much like Joe earlier, I forgot my citations:

[1] https://en.wikipedia.org/wiki/Disk_encryption_theory
[2]
https://crypto.stackexchange.com/questions/14628/why-do-we-use-xts-over-ctr-for-disk-encryption
[3] https://www.kernel.org/doc/html/latest/filesystems/fscrypt.html

Jonathan