Contents
SSH connection with authentication using public key cryptography
Creation of public and private key pairs
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): Created directory '/home/huong/.ssh'. Enter passphrase (empty for no passphrase): Enter same passphrase 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:Yq9/XCRZ6jjImkPg2FvzwFaAHaIiaoZGmMUVq6uYo18 huong@Lepard The key's randomart image is: +--[ED25519 256]--+ | .o++o | |.+o.o. . | |*. .. + | |* .. . + . | |oB.o oo.So o | |= o.B.ooo . . | | .=E* .o . | |oo..+ .. 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 : Server Login User
Password : Password for the same user
Click "Save"
Site name : Any name
Click "OK"
After confirming the server, click "Login".
Click "Update" when the following screen appears
Password of the logged-in user in the Password field
When connected, the left column is the server side and the right column is the PC (Windows) side.
Save the file “id_ed25519” in the .ssh directory to a suitable location on Windows in the right column.
Editing SSH Configuration File
Edit the SSH configuration file to disable password authentication.
This time, instead of being an ordinary user, su - to become root.
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$ su - Password: # vi /etc/ssh/sshd_config # Line 66 : Changed to no password authentication 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 Check "Replace...." and click "Continue".
User name : Login User Name
Password : Password specified in the creation of a public/private key pair
Under "Use RSA/DSA/ECDSA/ED25519 key to log in", set "Private key file:" to "id_ed25519" that you just saved in Windows. and click "OK".
Creating a private key using PuTTYgen
Start Winscp and launch [Run Puttygen] from [Tools].
Select the appropriate server
Click Load
The [ Open File Dialog ] will open, change the file type to [ All Files (*. Change the file type to [ All Files (*. *) ] and load the private key id_ed25519 that was 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 the following
Use RSA/DSA/ECDSA/..." Specify "id_ed25519.ppk" saved in windows in the "Use RSA/DSA/ECDSA/..." field.
