You can login to a remote Linux server without entering password in 3 simple steps using ssky-keygen and ssh-copy-id as explained in this article.
ssh-keygen creates the public and private keys. ssh-copy-id copies the local-host’s public key to the remote-host’s authorized_keys file. ssh-copy-id also assigns proper permission to the remote-host’s home, ~/.ssh, and ~/.ssh/authorized_keys.
This article also explains 3 minor annoyances of using ssh-copy-id and how to use ssh-copy-id along with ssh-agent.
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Jul 09, 2019 Can I generate a new Private Key for my Certificate if I lose the old one? You can generate a new private key and CSR, or use the automatic CSR and key generation during Certificate reissue (this option is available for all Certificates except for the Multi-Domains). What does the Private Key.
Oct 05, 2007 ssh-keygen can generate both RSA and DSA keys. RSA keys have a minimum key length of 768 bits and the default length is 2048. When generating new RSA keys you should use at least 2048 bits of key length unless you really have a good reason for using a shorter and less secure key. 
Apr 11, 2018 Create a Strong SSH Key in Linux. SSH is a client/server protocol used for remote logins. Using cryptography for authentication, ssh provides an encrypted method to access your server. The two of the most popular methods of authentication are passwords based and public key.
Step 1: Create public and private keys using ssh-key-gen on local-host
Step 2: Copy the public key to remote-host using ssh-copy-id
Note: ssh-copy-id appends the keys to the remote-host’s .ssh/authorized_key.
Step 3: Login to remote-host without entering the password
The above 3 simple steps should get the job done in most cases.
We also discussed earlier in detail about performing SSH and SCP from openSSH to openSSH without entering password.
If you are using SSH2, we discussed earlier about performing SSH and SCP without password from SSH2 to SSH2 , from OpenSSH to SSH2 and from SSH2 to OpenSSH.
Using ssh-copy-id along with the ssh-add/ssh-agent
When no value is passed for the option -i and If ~/.ssh/identity.pub is not available, ssh-copy-id will display the following error message.
If you have loaded keys to the ssh-agent using the ssh-add, then ssh-copy-id will get the keys from the ssh-agent to copy to the remote-host. i.e, it copies the keys provided by ssh-add -L command to the remote-host, when you don’t pass option -i to the ssh-copy-id.
Three Minor Annoyances of ssh-copy-id
Following are few minor annoyances of the ssh-copy-id.
- Default public key: ssh-copy-id uses ~/.ssh/identity.pub as the default public key file (i.e when no value is passed to option -i). Instead, I wish it uses id_dsa.pub, or id_rsa.pub, or identity.pub as default keys. i.e If any one of them exist, it should copy that to the remote-host. If two or three of them exist, it should copy identity.pub as default.
- The agent has no identities: When the ssh-agent is running and the ssh-add -L returns “The agent has no identities” (i.e no keys are added to the ssh-agent), the ssh-copy-id will still copy the message “The agent has no identities” to the remote-host’s authorized_keys entry.
- Duplicate entry in authorized_keys: I wish ssh-copy-id validates duplicate entry on the remote-host’s authorized_keys. If you execute ssh-copy-id multiple times on the local-host, it will keep appending the same key on the remote-host’s authorized_keys file without checking for duplicates. Even with duplicate entries everything works as expected. But, I would like to have my authorized_keys file clutter free.
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Possible To Add Password To Rsa Private Key After Generation 7
How to Create a Public/Private Key Pair
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The standard procedure for creating a Solaris Secure Shell public/private key pair follows. For additional options, see the ssh-keygen(1)man page.
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Start the key generation program.
Enter the path to the file that will hold the key.
By default, the file name id_rsa, which represents an RSA v2 key, appears in parentheses. You can select this file by pressing the Return key. Or, you can type an alternative filename.
The public key name is created automatically. The string .pub is appended to the private key name.
Enter a passphrase for using your key.
This passphrase is used for encrypting your private key. A good passphrase is 10-30 characters long, mixes alphabetic and numeric characters, and avoids simple English prose and English names. A null entry means no passphrase is used. A null entry is strongly discouraged foruser accounts. Note that the passphrase is not displayed when you type it in.
Re-enter the passphrase to confirm it.
Check the results.
The key fingerprint, which is a colon-separated series of 2-digit hexadecimal values, is displayed. Check that the path to the key is correct. In the example, the path is /home/johndoe/.ssh/id_rsa.pub. At this point, you have created a public/private key pair.
Set up the authorized_keys file on the destination host.
Copy the id_rsa.pub file to the destination host. Type the command on one line with no backslash.
Tropico 4 product key generator free download. When you are prompted, supply your login password.
When the file is copied, the phrase “Key uploaded successfully.” is displayed.