Connexion SSH avec clé publique

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ssh-keygen -t rsa -b 4096
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ssh-keygen -t dsa
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ssh-keygen -t ecdsa -b 521
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ssh-keygen -t ed25519

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Generating public/private ed25519 key pair.
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Enter file in which to save the key (/home/contact/.ssh/id_ed25519):
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Created directory '/home/contact/.ssh'.
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Enter passphrase (empty for no passphrase):
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Enter same passphrase again:
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Your identification has been saved in /home/contact/.ssh/id_ed25519
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Your public key has been saved in /home/contact/.ssh/id_ed25519.pub
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The key fingerprint is:
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SHA256:monhash contact@mondomaine
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The key's randomart image is:
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+--[ED25519 256]--+
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|%@+.             |
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|EBCVB.           |
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|+=Bo.            |
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|+.o* .           |
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|oo..o . S S      |
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|=+oo   o         |
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|B++ o . .        |
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|+=.. o .         |
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|o.    . .        |
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+----[SHA256]-----+

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ssh-copy-id contact@mondomaine

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/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
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The authenticity of host 'dns.it.fr (172.16.10.10)' can't be established.
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ECDSA key fingerprint is SHA256:lda9Psn+r3CoE3P2eH2hDAR6f50GaTNlUTF5Hw+QqKA.
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Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
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/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
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/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
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admin@dns.it.fr's password:
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Number of key(s) added: 1
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Now try logging into the machine, with:   "ssh 'admin@dns.it.fr'"
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and check to make sure that only the key(s) you wanted were added.

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ssh admin@dns.it.fr