| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Stephen Frost <sfrost(at)snowman(dot)net>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Tom Kincaid <tomjohnkincaid(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com> |
| Subject: | Re: storing an explicit nonce |
| Date: | 2021-05-25 18:56:32 |
| Message-ID: | 20210525185632.GC3048@momjian.us |
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| Lists: | pgsql-hackers |
On Tue, May 25, 2021 at 02:25:21PM -0400, Robert Haas wrote:
> One question here is whether we're comfortable saying that the nonce
> is entirely constant. I wasn't sure about that. It seems possible to
> me that different encryption algorithms might want nonces of different
> sizes, either now or in the future. I am not a cryptographer, but that
> seemed like a bit of a limiting assumption. So Bharath and I decided
> to make the POC cater to a fully variable-size nonce rather than
> zero-or-some-constant. However, if the consensus is that
> zero-or-some-constant is better, fair enough! The patch can certainly
> be adjusted to cater to work that way.
A 16-byte nonce is sufficient for AES and I doubt we will need anything
stronger than AES256 anytime soon. Making the nonce variable length
seems it is just adding complexity for little purpose.
--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com
If only the physical world exists, free will is an illusion.
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