Can someone with access to only my Yubikey gain access to my server that has SSH access via an ED25519-sk keypair?

My understanding is that an ED25519-sk SSH key generated by OpenSSH generates a private key stub that lives on your host machine. This stub is just a reference to the actual private key that lives on the actual hardware key itself.
My unde… Continue reading Can someone with access to only my Yubikey gain access to my server that has SSH access via an ED25519-sk keypair?

How to create, use and backup android signing keys without trusting the computer?

I did a lot of research on how to securely create, use and backup android signing keys (when using Google Play Signing is not an option). The best option seams to be a Yubikey or a Nitrokey HSM 2 and use their pkcs11 capability [0].
Backin… Continue reading How to create, use and backup android signing keys without trusting the computer?

Reading SSH private key physically stored on yubikey to remote into external PC

I was wondering if it’s possible to only store and read a ssh private key on a yubikey and not read the private key the yubikey generated from a client computer?
Currently the only way it seems to work is that I store the private key on cl… Continue reading Reading SSH private key physically stored on yubikey to remote into external PC