From: | Andres Freund <andres(at)anarazel(dot)de> |
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To: | Stephen Frost <sfrost(at)snowman(dot)net> |
Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, 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: | 2021-05-27 17:07:29 |
Message-ID: | 20210527170729.egdx6gxwgjjofmef@alap3.anarazel.de |
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Lists: | pgsql-hackers |
Hi,
On 2021-05-27 12:49:15 -0400, Stephen Frost wrote:
> That's not really a reason to rule it out though and Bruce's point about
> having a way to get to an encrypted cluster from an unencrypted one is
> certainly worth consideration. Naturally, we'd need to document
> everything appropriately but there isn't anything saying that we
> couldn't, say, have XTS in v15 without any adjustments to the page
> layout, accepting that there's no data integrity validation and focusing
> just on encryption, and then returning to the question about adding in
> data integrity validation for a future version, perhaps using the
> special area for a nonce+tag with GCM or maybe something else. Users
> who wish to move to a cluster with encryption and data integrity
> validation would have to get there through some other means than
> replication, but that's going to always be the case because we have to
> have space to store the tag, even if we can figure out some other
> solution for the nonce.
But won't we then end up with a different set of requirements around
nonce assignment durability when introducing GCM support? That's not
actually entirely trivial to do correctly on a standby. I guess we can
use AES-GCM-SSIV and be ok with living with edge cases leading to nonce
reuse, but ...
Greetings,
Andres Freund
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