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While on the subject, does anyone know how to actually put a 4096 bit key on a Yubikey 4? I've been trying for months and their support is non-existent.

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You need to use gpg2 explicitly (gpg 1.x and 2.x are under independent active development), e.g. `gpg2 --edit-key`.

AHA! Thanks, I'll try this later tonight!

I had no problem with it, gpg --edit-key + keytocard worked flawlessly.

Weird, when I try keytocard it errors about the size of the key, but when I tried it with a 2048 bit key it worked fine

Maybe old gpg/scdaemon version? Mine is 2.1.11. I don't know what else could be wrong.

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