Configure SSH connection with key authentication

In this tutorial, I will configure the SSH connection with key authentication.

How it works

  • (Client) Generate a set of secret key and public key
  • (Connection destination server) Register public key
  • (Connection destination server) Accepts a connection from a client, encrypts the random number using the public key
  • (Connection destination server) Hashed random number
  • (Client) hashes the received random number and forwards the hash value to the server
  • (Connection destination server) Compare the hash value sent by the client and the hash value generated on the server side

Set up SSH connection with key authentication.

1: Generation of a key set

ssh-keygen -t rsa -f client01

2: Public Key Registration

# Work on the server, target users to connect
cat client01.pub >> .ssh/authorized_keys

3: Enabling Key Authentication

  # vim /etc/ssh/sshd_config
  RSAAuthentication yes
  PubkeyAuthentication yes
  AuthorizedKeyFile .ssh/authorized_keys
  # Disable password authentication if you want to strengthen it
   PasswordAuthentication no

Try to connect

ssh -i .ssh/client01 -p12345 huupv@devopsroles

Conclusion

Thought the article, How to configure SSH connection with key authentication in Linux.

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About HuuPV

My name is Huu. I love technology and especially Devops Skill such as Docker, vagrant, git so forth. I likes open-sources. so I created DevopsRoles.com site to share the knowledge that I have learned. My Job: IT system administrator. Hobbies: summoners war game, gossip.
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