December 31, 2016

Lab 5.1 - Copy the public key with ssh-copy-id

I am doing the Lab 5.1 and I try to issue the command 

ssh-copy-id elyasin@localhost

I see the message The authenticity of host 'localhost(::1)' can't be established.

Can anyone explain to me what that this message means? Is it expected to appear? What would be the solution?

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