The private key should be moved to the computer/smartphone where you will be using the SSH client. The key will be 2048 bits long: breaking the encryption on a key of that length would take an extremely long time, so it is very secure. Once you complete the process you will find two files: the private key called id_rsa and the associated public key called id_rsa.pub. Note that you should generate the keys only once (otherwise you will overwrite them) by calling the command with the user you want use the keys with. Leave the field empty if you do not want to use this option. The counterpart is that you will have to write the passphrase every time you want to use the key. Thus, if somebody steals your key, he will not be able to use it unless he knows the passphrase too. This extra security step will make your private key useless without the passphrase. You can use the default location /home/dummyUser/.ssh/id_rsa by just hitting Enter. After entering the command, you will be asked where to save the key par. You can use your email or a description to make it easier to identify your keys. Ssh - keygen - t rsa - C dummyUser domoticproject. You can generate the key pair directly in your Raspberry by using the ssh-keygen command: ![]() The client will use his private key to encrypt this message and only if the server is able to decrypt this message back to the original challenge using the public key, can the identity of the client be confirmed. When a client wants to connect to a SSH server, the server will send him a challenge message based on the public key. One of the keys will be private and should never be released, meanwhile the public key can be freely shared. With this last option, you will generate two keys cryptographically linked to each other. Moreover, to do it even safer, you can also use key-based authentication, replacing the password by a key par of cryptographically secure keys. If your Raspberry Pi is exposed to the internet, it is very important to ensure that you have a very robust password. This will help to avoid dictionary attacks against your machine. Congratulations, your server is now headless! You can access directly to the Raspberry console from another computer. From this point you can disconnect the keyboard and mouse, as well as the monitor, of your Raspberry Pi. You will be asked to insert your username and password and, after a few seconds, you will reach the command line of your Raspberry Pi. For instance, in PuTTY portable edition just open it, write down your IP address and port and click in open. For Android devices I have been using JuiceSSH with very good results.Įvery program will have its own configuration. ![]() ![]() If you are using Windows, I would recommend to download PuTTY. Going headlessīy this time you should be able to connect remotely to your Raspberry Pi from another computer or device in your network using an SSH Client. You should adapt the file to match with your local network configuration, selecting your desired address, netmask and gateway.
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