| From: | Joe Conway <mail(at)joeconway(dot)com> |
|---|---|
| To: | Antonin Houska <ah(at)cybertec(dot)at>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Ryan Lambert <ryan(at)rustprooflabs(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Masahiko Sawada <sawada(dot)mshk(at)gmail(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 12:25:27 |
| Message-ID: | e9c16011-fae5-5965-cd2b-64c8beaeaaa7@joeconway.com |
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| Lists: | pgsql-hackers |
On 7/10/19 4:47 AM, Antonin Houska wrote:
> Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
>> I don't think that works, because that'd mean we're encrypting the same
>> page with the same nonce over and over, which means reusing the reuse
>> (even if you hash/encrypt it). Or did I miss something?
>
> I found out that it's wrong to use the same key (or (key, IV) pair) to encrypt
> different plain texts [1], however this is about *stream cipher*. There should
> be some evidence that *block cipher* has similar weakness before we accept
> another restriction on the IV setup.
>
> [1] https://en.wikipedia.org/wiki/Stream_cipher_attacks#Reused_key_attack
There is plenty of guidance that specifies CBC requires unique,
unpredictable, but not necessarily secret IV. See for example Appendix C
here:
https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38a.pdf
Joe
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