{"id":324,"date":"2022-07-08T11:04:56","date_gmt":"2022-07-08T11:04:56","guid":{"rendered":"https:\/\/www.webhi.com\/how-to\/?p=324"},"modified":"2023-10-21T08:59:00","modified_gmt":"2023-10-21T08:59:00","slug":"how-to-use-a-private-key-for-ssh-authentication","status":"publish","type":"post","link":"https:\/\/www.webhi.com\/how-to\/how-to-use-a-private-key-for-ssh-authentication\/","title":{"rendered":"How to use a Private key for SSH authentication"},"content":{"rendered":"\n
\"Use<\/figure>\n\n\n\n

What’s a private key? <\/h2>\n\n\n\n

Even the most complex passwords cannot match the cryptographic strength of private keys. With SSH, private keys significantly improve security by relieving users of the burden of remembering complex passwords (or worse yet, writing them down).<\/p>\n\n\n\n

Let’s first Open a terminal and generate a private key.<\/p>\n\n\n\n

Step 1 : Check to see if you already have an SSH key.<\/h2>\n\n\n\n
$ ls ~\/.ssh<\/code><\/pre>\n\n\n\n
Output:<\/kbd><\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Step 2 : Create SSH key.<\/h2>\n\n\n\n
$ ssh-keygen<\/code><\/pre>\n\n\n\n
Output:<\/kbd><\/p>\n\n\n\n
\"\"
– The command will prompt you for a file name. By default, the ssh key pairs are stored as id_rsa and id_rsa.pub for private key and public key, respectively.<\/figcaption><\/figure>\n\n\n\n
$ Enter file in which to save the key (\/home\/ubuntu\/.ssh\/id_rsa):<\/kbd><\/p>\n\n\n\n
To use the default filename, press ENTER and proceed.<\/p>\n\n\n\n
In the next part, enter a passphrase to secure your key pairs. You can skip this by pressing ENTER.<\/p>\n\n\n\n
$  Enter passphrase (empty for no passphrase):<\/kbd><\/p>\n\n\n\n
$  Enter same passphrase again:<\/kbd><\/p>\n\n\n\n
Step 3 : Copy public key to the remote host.<\/h2>\n\n\n\n
$ ls ~\/.ssh<\/code><\/pre>\n\n\n\n
Output:<\/kbd><\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
To use the SSH key pair you created, we must first copy the public key to the remote server. Fortunately, OpenSSH includes the ssh-copy-id function to do this.<\/p>\n\n\n\n
$ ssh-copy-id remote_server_user@remote_server_ip<\/code><\/pre>\n\n\n\n
\"\"<\/figure>\n\n\n\n
Step 4 : SSH using The Private Key.<\/h2>\n\n\n\n
$ ssh remote_server_user@remote_server_ip<\/code><\/pre>\n\n\n\n
\"\"<\/figure>\n\n\n\n
You have now successfully utilized SSH key-based authentication. By eliminating password login, you may provide an extra degree of protection.<\/p>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
This tutorial has shown you how to create SSH key pairs and copy the keys to remote hosts. The steps mentioned above allow you to authenticate SSH sessions without using a password. Furthermore, you may control numerous servers at the same time with a single key pair.<\/p>\n","protected":false},"excerpt":{"rendered":"
What’s a private key? Even the most complex passwords cannot match the cryptographic strength of private keys. With SSH, private keys significantly improve security by relieving users of the burden of remembering complex passwords (or worse yet, writing them down). Let’s first Open a terminal and generate a private key. Step 1 : Check to ..<\/p>\n
<\/div>\n
Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[69,3],"tags":[],"yoast_head":"\nHow to use a Private key for SSH authentication - WebHi Tutorials & Documentations<\/title>\n<meta name=\"description\" content=\"Authentication with a private key improves the security of a server in the connection process. 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