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for ssh without password, are both ways correct

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Last Modified: 2016-04-18
Now I need to ssh to a Linux Machine B from another Linux or Mac or Windows with Putty (Machine A). I've seen two ways to do that.
1. Generate public and private key on Machine A. Send the public key to Machine B and add it to authorized keys file. And now Machine A can ssh to Machine B without any password.
2. Generate public and private key on Machine B. Send the private key to Machine A. And now Machine A can ssh to Machine B with B's private key.

So are both ways correct? What are the differences? Thanks.
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