Set up SSH keys

How to setup access to Linux systems using SSH keys.

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Linux server:

cd ~/.ssh
$ ssh-keygen -t ed25519

Put id_ed25519.pub key content -> ~/.ssh/authorized_keys

$ chmod 700 ~/.ssh
$ chmod 600 ~/.ssh/authorized_keys
$ chown $USER:$USER ~/.ssh -R

Windows client:

copy Linux server: id_ed25519 -> Windows: C:\users\<user>\.ssh\id_ed25519_<server name>_<server user>  

In Solar-putty:  
Left-top menu-dots: Generate certificates  

In Putty keygen:  
Conversions/import key: C:\users\<user>\.ssh\id_ed25519_<server name>_<server user>  

Save private key: 
id_ed25519_<server name>_<server user>.ppk  

Solar-putty: Settings/Credentials/Private key: 
id_ed25519_<server name>_<server user>.ppk  

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Last modified: 24 November 2025