Raspberry Pi Generate Ssh Host Keys

So here's is my guide to change the already generated ssh keys that everyone has installed on kali:
After all we are hot on security right???? We dont want the same keys as the next man do we (MITM).....
Move the default Kali ssh keys to a new folder:
cd /etc/ssh/
mkdir default_kali_keys
mv ssh_host_* default_kali_keys/

This will move your default keys to the new folder...
Regenerate the keys:

dpkg-reconfigure openssh-server
Creating SSH2 RSA key; this may take some time ...
Creating SSH2 DSA key; this may take some time ...
Creating SSH2 ECDSA key; this may take some time ...
insserv: warning: current start runlevel(s) (empty) of script `ssh' overrides LSB defaults (2 3 4 5).
insserv: warning: current stop runlevel(s) (2 3 4 5) of script `ssh' overrides LSB defaults (empty).
Verify ssh key hashes are different:
md5sum ssh_host_*
Compare new key hashes to the hashes below)
cd default_kali_keys/
md5sum *

b9419ea3a8fff086c258740e89ca86b8 ssh_host_dsa_key
f9a5b57d7004e3740d07c5b037d15730 ssh_host_dsa_key.pub
58e49e0d7b24249c38db0c9cf595751b ssh_host_ecdsa_key
597c83fabf3c1e4f2c7af74af05ac671 ssh_host_ecdsa_key.pub
cc0d92036bb86797bed354338faa7223 ssh_host_rsa_key
cc9ddc90b891b5251ed4ea8341495e84 ssh_host_rsa_key.pub
Job done !!!! I would also change the default port from 22 to another in the ssh_config
Here is my win 7 phone running ssh connected to Kali and running attaxsuite:
Kali screens:
Kind Regards Dee
  1. Raspberry Pi Password Ssh
  2. Raspberry Pi Generate Ssh Host Keys Free
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  4. Raspberry Pi Generate Ssh Key
  5. Raspberry Pi Generate Ssh Host Keys List

Raspberry Pi generates predictable SSH keys. Generate SSH host keys right at startup, it will put together predictable values that are far less secure than what it would generally be needed.

Setting up SSH keys on a Raspberry Pi is relatively easy and can make connecting to one over a network more convenient. In this tutorial we’ll explain how to create and configure SSH keys so you can connect to a Pi remotely without needing to enter a password.

SSH keys are created using “Public-key cryptography”. This is a concept where a public key is stored on the remote device (i.e. a Raspberry Pi) and a private key is used by the owner to prove they own the keys. The public key could be given to everyone but the private key must be kept secret.


In practice the keys are long strings of characters stored in a text file.

To continue with this tutorial you must have either direct access to the Pi with a keyboard and monitor or remote access using SSH or VNC.

Step 1 : Create SSH Directory & authorized_keys File

To start with navigate to the home directory :

and create a new directory called “ssh” :

Navigate into the new directory :

and create an empty “authorized_keys” file :

Step 2 : Set Permissions

The permissions on the ssh directory need to be modified :

Raspberry Pi Password Ssh

Next change the permissions on the “authorized_keys” file so only the Pi user can read and write :

Step 3 : Creating A New Key Pair

If you want to create a fresh key pair then this is easy to do using the ssh-keygen utility.

Navigate to the SSH directory :

then run the ssh-keygen utility :

You will be prompted for a location to save the key file. Press ENTER to accept the default.

You will be asked for a passphrase. This is optional. If you use a passphrase you may be asked for it when using the key. It is an extra security step and you will have to decide if you want to make use of it. Either type a passphrase or leave it blank and press ENTER to finish.

If you use a passphrase do not forget it!

This process should create two files for you. A Public key named “id_rsa.pub” and a matching Private key named “id_rsa”.

Add the contents of the Public key to the authorized_keys file using :

Some clients prefer PuTTY style keys. I would recommend creating this format now so you have the choice in the future. The following commands will install puttygen and create a PuTTY version of your new key :

then :

You should now have three files :

  • id_rsa
  • id_rsa.pub
  • id_rsa.ppk

Raspberry Pi Generate Ssh Host Keys Free

Copy these files to a safe location. The Private key (id_rsa or id_rsa.ppk) is required by the client you use to connect to the Pi. This might be a PC, laptop or mobile phone. The Public key (id_rsa) is used by the Pi you wish to connect to.

Raspbian Ssh Key

You can use the same Public key on multiple devices as long as you have the Private key to match.

Once you have safely stored the keys somewhere else they can be deleted from the Pi :

Step 4 : Adding an Existing Key

If you already have a Public/Private key pair you can add the Public key to the “authorized_keys” file.

You’ve got two methods for putting the public key details into the keys file.

The first method is to edit the keys file directly :

and paste the contents of the Public key file into the editor. Use CTRL-X, Y and ENTER to save the changes and return to the command line.


The second method is to copy the Public key file (e.g. id_rsa.pub) into the .ssh directory. Then use the following command to add it to the keys file :

where “id_rsa.pub” is your Public key file.

Once the authorized_keys file has been updated you can delete the id_rsa.pub file :

Step 5: Configure SSH Client

At this point you should be able to use your favourite SSH client to connect to the Pi but rather than specify a password you can point it to the Private key. The exact process for doing this will depend on the client used.

As an example here are the session settings in WinSCP :

The IP address and username must be specified. Under “Advanced” it allows a Private key file to be selected. WinSCP prefers Putty style keys but will convert an OpenSSH key into a ppk with a single click.

Other SSH clients operate in a similar way.

Step 6: Connect

If configured correctly connections to the Pi can now be made without having to enter a password.

Although many clients can remember passwords the advantage with SSH keys is that you can use the same key file in all your clients. If you change the key file you won’t have to change the password in all the places you may have it remembered.

You can also store the Private key on a removable drive or within an encrypted container (i.e. Veracrypt). This means if your computer is stolen the connections to your devices won’t work even if someone can open your SSH client and see your saved sessions. No key file no access!

Raspberry Pi Generate Ssh Key

Convert PPK Files to Private and Public Keys with puttygen

At some point in the future you may need to convert a Putty PPK file to OpenSSH style keys files. Here are the commands you can use to convert a PPK to private and public keys :

This guide will allow you to login to your Pi using SSH keys but the standard username/password approach will still work. Make sure you have changed the default Raspberry Pi password to something secure. I tend to use a password that is at least 15 characters long.

Raspberry Pi Generate Ssh Host Keys List

It is possible to rely on SSH keys completely and disable the ability to log in with a password. However this is beyond the scope of this guide.