Hi José and Vagrant, It seems bugs #998728, 1008573, and #1032907 are all the same. Perhaps the maintainers would like to merge them.
Thanks for your workaround, Vagrant; I found that adding KexAlgorithms -sntrup761x25519-sha...@openssh.com to my ~/.ssh/config allows me to connect to a Bookworm machine, from Bookworm, and also to hosts running a newer OpenSSH daemon. A similar issue upstream is here: https://dev.gnupg.org/T6250 Werner K. hints that it might be fixed in the GnuPG 2.3 series. As soon as the maintainers upload it to experimental, I will be happy to test it. Thanks everyone for your attention.
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