Hi I have pushed a (quite preliminary) branch that adds SPHINCS+ SSH signature support for OpenSSH: https://github.com/jas4711/openssh-portable/tree/sphincsp I've written a bit about it here: https://blog.josefsson.org/2024/12/23/openssh-and-git-on-a-post-quantum-sphincs/ What do you think? My primary use-case is for ssh-keygen -Y sign/verify usage to protect Git commits. It isn't inconceivable that someone would find interactive SSH use of interest, although I didn't make an effort to test this. /Simon
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