SECURITY_cheatsheet.md

SECURITY CHEAT SHEET

Passwordless SSH login

STEP ONE: Generate an RSA key using ssh-keygen on your local machine

Unless you've already created one!

ssh-keygen -t rsa

This creates a public/private keypair of the type (-t) rsa.

Generating a public/private rsa key pair.
Enter the file in which you wish to save they key (i.e., /home/username/.ssh/id_rsa).

Once the keypair is created, you are prompted to enter the following items. Click Enter on your keyboard to continue.

Enter a passphrase (leave empty for no passphrase).

Click Enter on your keyboard to continue.

Enter same passphrase again:

Click Enter on your keyboard to continue. When finished, click Enter on your keyboard. The following message appears:

Your identification has been saved in /home/username/.ssh/id_rsa
Your public key has been saved in /home/username/.ssh/id_sra.pub

The key fingerprint is:
ar:bc:d3:9e:g3:1f:63:6f:6b:32:2e:97:ee:42:e1:be [email protected]

The key’s randomart image is:

+--[ RSA 2048]----+
| ..+**B.o++o     |
|  . o+==o. o     |
|    . .oo.=      |
|      . +E+ .    |
|        S .      |
|                 |
|                 |
|                 |
|                 |
+-----------------+

STEP TWO: Copying the public key to Linux VPS or server

Copy the public key on your local computer to Linux server by running the following command on your Linux or Mac machine.

ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]

You will be asked to enter password for this username on a remote Linux server. After that you will be asked to enter your RSA key password.