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Sorry.

Generate new keys for each service, device, client, and server. Don't share them. Don't copy them.

This still isn't very useful. Suppose you have a database, and an elastic number of workers that need to connect.

Still good advice. Generate a keypair on each new machine and only ever move around public keys.

If you are copying over private keys to connect, or reusing private keys, you are doing something wrong.

The most common weak security point in any system is people. If you are sharing keys and you ever need to revoke a shared key, you're in for a bad time

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