Is SSH key machine specific?

Yes, that's perfectly legitimate. ssh keys don't care where they were generated, and it's fine to have them on multiple machines at once. Try giving the ssh client the "-v" or "-vv" option (for verbose output) and check the server's ssh log to debug the problem.

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Subsequently, one may also ask, are SSH keys user specific?

yes, a private key can be linked to one or more users using authorized_keys file. In order for your linux server to recognize and accept your key pair, you will need to upload your public key to your server. This file is stored inside a directory named . ssh/ under the user's home folder.

Similarly, can SSH keys be shared? Shared SSH keys is never a solution. Don't. Give each user a key and add all three to the remote host. If you really can't do that for whatever stupid reason on the remote host (some kind of device that only accepts a single key?), copy the key to each user's ~/.

In respect to this, can you use the same SSH key on multiple computers?

Yes, that's perfectly legitimate. ssh keys don't care where they were generated, and it's fine to have them on multiple machines at once.

What type of SSH key should I use?

Unless there is a good reason not to, you should always authenticate using SSH keys. A number of cryptographic algorithms can be used to generate SSH keys, including RSA, DSA, and ECDSA. RSA keys are generally preferred and are the default key type. Generating public/private rsa key pair.

Related Question Answers

Do SSH keys expire?

Traditional SSH keys have no expiry; in fact they have no metadata whatsoever (except maybe a comment field).

What is SSH private key?

SSH public-key authentication relies on asymmetric cryptographic algorithms that generate a pair of separate keys (a key pair), one "private" and the other "public". You keep the private key a secret and store it on the computer you use to connect to the remote system.

What is SSH key used for?

Definition. SSH uses public-key cryptography to authenticate the remote computer and allow it to authenticate the user, if necessary. There are several ways to use SSH; one is to use automatically generated public-private key pairs to simply encrypt a network connection, and then use password authentication to log on.

Where are SSH keys stored?

By default, the keys will be stored in the ~/. ssh directory within your user's home directory. The private key will be called id_rsa and the associated public key will be called id_rsa.

How do I find my SSH private key?

To generate an SSH key with PuTTYgen, follow these steps:

1. Open the PuTTYgen program.
2. For Type of key to generate, select SSH-2 RSA.
3. Click the Generate button.
4. Move your mouse in the area below the progress bar.
5. Type a passphrase in the Key passphrase field.
6. Click the Save private key button to save the private key.

What does an SSH key look like?

An SSH key is an alternate way to identify yourself that doesn't require you to enter you username and password every time. SSH keys come in pairs, a public key that gets shared with services like GitHub, and a private key that is stored only on your computer. If the keys match, you're granted access.

How are SSH keys generated?

SSH uses pre-generated public and private keys. Once generated these keys are stored for future use. The content of the keys should not be related to the hardware or O/S, but do depend on the random numbers they provide. Public keys and are freely distributable, and are automatically exchanged during the connection.

How do I use SSH keys?

How to set up SSH keys

1. Create the ssh key pair using ssh-keygen command.
2. Copy and install the public ssh key using ssh-copy-id command on a Linux or Unix server.
3. Add yourself to sudo or wheel group admin account.
4. Disable the password login for root account.
5. Test your password less ssh keys login using ssh [email protected] command.

Do I need more than one SSH key?

You only need one key as the key belongs to your user. There is no need (and no improvement in security) by having one key per host. As long as your private key is kept private you can go with this single key and use it to authenticate yourself against multiple hosts.

Is public key unique?

Unlike symmetric key algorithms that rely on one key to both encrypt and decrypt, each key performs a unique function. The public key is used to encrypt and the private key is used to decrypt.

Could not open a connection to your authentication agent?

On the other hand, if you get the “Could not open a connection to your authentication agent” error again, the agent needs full reassignment. If you're working with the regular shell, then just run ssh-agent /bin/sh and then ssh-add ~/. ssh/id_rsa, once again making sure to replace the name of the key.

How do I copy a SSH key?

The process is as follows.

1. Generate an SSH Key. With OpenSSH, an SSH key is created using ssh-keygen.
2. Copy the key to a server.
3. Test the new key.
4. Troubleshooting.
5. Use a passphrase when possible.
6. Add a command restriction when possible.
7. Managing SSH keys.
8. Installation using Homebrew.

How do I generate an SSH key in Linux?

3. Generate a new SSH key

1. Log in to your local computer as an administrator.
2. In a command prompt, run: ssh-keygen -t rsa -C "[email protected]"
3. Just press <Enter> to accept the default location and file name. If the .
4. Enter, and re-enter, a passphrase when prompted.
5. You're done!

How do I copy a SSH key in Linux?

Step 1 : Create a Key Pair in the Source Server

1. In line “Enter file in which to save the key (/root/.ssh/id_rsa):”
2. To do this we have to manually append the content of your id_rsa. pub file to the /root/. ssh/authorized_keys file on your Destination machine.
3. Your public key has been saved in /root/. ssh/id_rsa. pub.

How do I establish SSH between two Linux servers?

SSH Passwordless Login Using SSH Keygen in 5 Easy Steps

1. Step 1: Create Authentication SSH-Kegen Keys on – (192.168. 0.12) First login into server 192.168.
2. Step 2: Create . ssh Directory on – 192.168. 0.11.
3. Step 3: Upload Generated Public Keys to – 192.168. 0.11.
4. Step 4: Set Permissions on – 192.168. 0.11.
5. Step 5: Login from 192.168. 0.12 to 192.168.

How do I create a private and public key?

How to Create a Public/Private Key Pair

1. Start the key generation program. myLocalHost% ssh-keygen Generating public/private rsa key pair.
2. Enter the path to the file that will hold the key.
3. Enter a passphrase for using your key.
4. Re-enter the passphrase to confirm it.
5. Check the results.
6. Copy the public key and append the key to the $HOME/.

What is an SSH key pair?

Understanding SSH Key Pairs. 1 Together they are known as a key-pair. In SSH, the public key cryptography is used in both directions (client to server and server to client), so two key pairs are used. One key pair is known as a host (server) key, the other as a user (client) key.

How do I get an RSA private key?

Generating Public and Private Keys with openssl.exe

1. In Windows: Open the Command Prompt (Start > Programs > Accessories > Command Prompt).
2. Press ENTER. The private key is generated and saved in a file named "rsa.
3. Generating the Private Key -- Linux.
4. Open the Terminal. Navigate to the folder with the ListManager directory.
5. Press ENTER.
6. Open the Terminal.

How do I configure SSH?

How to Enable SSH on Cisco Switch, Router and ASA

1. Setup Management IP. First, make sure you have performed basic network configurations on your switch.
2. Set hostname and domain-name. Next, make sure the switch has a hostname and domain-name set properly.
3. Generate the RSA Keys.
4. Setup the Line VTY configurations.
5. Create the username password.
6. Verify SSH access.