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SSH connection with authentication using public key cryptography
Create a public/private key pair for a user connecting to the Linux server using OpenSSH.
Use ssh-keygen to create key pairs.
Creation of public/private key pairs is performed with remote login user privileges.
If you do not specify the destination and file name, id_ed25519 and id_ed25519.pub will be created in /home/(user name)/.ssh/. On the way, enter the password for the key.
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# su - huong [huong@Lepard~]$ ssh-keygen -t ed25519 Generating public/private ed25519 key pair. Enter file in which to save the key (/home/huong/.ssh/id_ed25519): Enter passphrase (empty for no passphrase): [Password] Enter same passphrase again: [Password]again Your identification has been saved in /home/huong/.ssh/id_ed25519 Your public key has been saved in /home/huong/.ssh/id_ed25519.pub The key fingerprint is: SHA256:jkWIZvNhc5fHRioH3nTrTz7CLlbjVaOMmmkuKFaW1tY huong@Alma The key's randomart image is: +--[ED25519 256]--+ | . . o | | . o + * . | | = = = * = | | o + = + + ..| | + S + o..| | = * E oo*. | | + + . +ooo+ | | o . . =o... . | | . . +o .. | +----[SHA256]-----+ |
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$ cat ~/.ssh/id_ed25519.pub >> ~/.ssh/authorized_keys $ chmod 600 ~/.ssh/authorized_keys $ chmod 700 ~/.ssh/ |
Save the created private key id_ed25519 to an appropriate location on windows using winSCP.
Start Winscp
Host name : Server IP address
Port number : SSH port number
User name : User name
Password : User password
click "Save".
Site name : Any name
Click "OK"
After confirming the server, click "Login".
When the following screen appears, click "Update.
Password of the logged-in user in the Password field
When connected, the right column is the server side and the left column is the PC (Windows) side.
Save the file "id_ed25519" in the .ssh directory to an appropriate location on Windows in the left column.
Edit SSH configuration file
Edit the SSH configuration file to disable password authentication.
su - to become root.
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$ su - Password: # vi /etc/ssh/sshd_config # Line 65 : Change to password authentication disabled PasswordAuthentication no # systemctl restart sshd |
How to connect with Tera Term
Start Tera Term, and select "File" menu "New connection"
Host : Server IP Address
TCP port : SSH port number
If you get the following security warning "Replace…. and click "Continue".
User name : Login User Name
Password :Password specified in the creation of a public/private key pair
Use RSA/DSA/ECDSA/ED25519 key to log in /Private key file : Set "id_ed25519" saved in Windows
Click "OK"
Creating a private key using PuTTYgen
Launch Winscp and start [Run PuTTYgen] from Tools
Select the appropriate server
Click "Load"
Click Load to open the Open File dialog box, change the file type to [ All Files (. Change the file type to [ All Files (. *) ] and load the private key id_ed25519 transferred from the Linux server.
The password is the password set in "Creating a public and private key pair" above
Click on "Save private key"
Save the file with the extension ".ppk" in the same place as "id_ed25519" saved earlier on the Windows side under the name "id_ed25519.ppk".
Select the appropriate server and click "Edit"
Click on "Advanced"
Open the "Authentication" menu and specify "id_ed25519.ppk" saved in Windows for "Private key file".
Click "Save"
Click on "Login"
The password is the password set in "Creating a public and private key pair" above
When connecting with Tera Term
"Use RSA/DSA/ECDSA/…" field : Specify "id_ed25519.ppk" saved in windows
