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Security advices - ssh root access login

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linux-howto

http://serverfault.com – I'd like to have some advices on my case: I have a server with a public ip address. I have a root user with password. I have turn off (in sshd) PermitRootlogin = No Questions/tips/advices: How can I delete password of root and access this server with ssh without any passwords? Do I need to use only sudo with an user to get root access? Thanks (HowTos)