this post was submitted on 20 Jul 2024
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It's assymetric crypto. You'd need to find a matching public key. Or it's just some useless characters. I suppose that's impossible, or what we call that... Like take a few billion years to compute. But I'm not an expert on RSA.
Public keys are derived from the private key. The asymmetric part is for communication not generation. Afaik
I'm pretty sure the cryptographic parameters to generate a public key are included in the private key file. So while you can generate the other file from that file, it's not only the private part in it but also some extra information and you can't really change the characters in the private key part. Also not an expert here. I'm fairly certain that it can't happen the other way round, or you could impersonate someone and do all kinds of MITM attacks... In this case I've tried it this way, changed characters and openssh-keygen complains and can't generate anything anymore.
The surprised man in the middle
Reddit did it in reverse for Tor