Hi!
On 7/16/25 08:47, Richard Clayton wrote:
[...]
Our approach has been to allow a DKIM2 header field to contain either
one or two signatures. The detailed syntax document (which I am trying
hard to get finished !) requires s1, a1, b1 and bh2 (viz the selector,
algorithm and the body & header hashes). [these were s,a,b,bh in DKIM1]
Optionally s2,a2,b2 and bh2 may also be provided.
I'd not like to hardcode a limit of 2 in the syntax.
For example a sender might, with overlap, want to migrate the
"conventional" algorithm from RSA to ED25519, but also to add PQC. This
would be 3 algorithms temporarily.
[...]
Hannah.
-- Hannah Stern Mail System Development
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