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1

That's highly unlikely. If you're not on a shared computer, it's even less likely. You can add HashKnownHosts no to your ~/.ssh/config to disable hashing the host names, then purge your ~/.ssh/known_hosts file, and then re-populate it over time as you log in to your various remote hosts. As Jasen answered, you'll have to repeat the process of accepting them ...


2

Known hosts usually has hashed records and some services that it is used for (eg: github) have multiple servers resulting in multiple records in the file. You can delete the file and re-generate a new one, that will mean you'll get alerts from ssh for each server.


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