Does ssh key need to be named id_rsa?


By default, ssh searches for id_dsa and id_rsa files. The keys do not have to be named like this, you can name it mykey just as well, or even place it in a different directory. However, if you do either of those, then you need to explicitly reference the key in the ssh command like so:

ssh user@server -i /path/to/mykey

If a command does not accept -i, e.g. sshfs, use the IdentityFile option:

sshfs -o IdentityFile=/path/to/mykey user@host:/path/on/remote /mountpoint

How It Works

When generating a key, you'll get two files: id_rsa (private key) and (public key). As their names suggest, the private key should be kept secret and the public key can be published to the public.

Public-key authentication works with a public and a private key. Both the client and the server have their own keys. When installing openssh-server the server public and private keys are generated automatically. For the client, you'll have to do that on your own.


0 0

What Is ssh-keygen?

Ssh-keygen is a tool for creating new authentication key pairs for SSH. Such key pairs are used for automating logins, single sign-on, and for authenticating hosts.

SSH Keys and Public Key Authentication

The SSH protocol uses public key cryptography for authenticating hosts and users. The authentication keys, called SSH keys, are created using the keygen program.

SSH introduced public key authentication as a more secure alternative to the older .rhosts authentication. It improved security by avoiding the need to have password stored in files, and eliminated the possibility of a compromised server stealing the user's password.

However, SSH keys are authentication credentials just like passwords. Thus, they must be managed somewhat analogously to user names and passwords. They should have a proper termination process so that keys are removed when no longer needed.

The simplest way to generate a key pair is to run...

0 0

About SSH Keys

SSH keys provide a more secure way of logging into a virtual private server with SSH than using a password alone. While a password can eventually be cracked with a brute force attack, SSH keys are nearly impossible to decipher by brute force alone. Generating a key pair provides you with two long string of characters: a public and a private key. You can place the public key on any server, and then unlock it by connecting to it with a client that already has the private key. When the two match up, the system unlocks without the need for a password. You can increase security even more by protecting the private key with a passphrase.

Step One—Create the RSA Key Pair

The first step is to create the key pair on the client machine (there is a good chance that this will just be your computer):

ssh-keygen -t rsa

Step Two—Store the Keys and Passphrase

Once you have entered the Gen Key command, you will get a few more questions:

0 0

The previous answers have properly explained the way to create a configuration file to manage multiple ssh keys. I think, the important thing that also needs to be explained is the replacement of a host name with an alias name while cloning the repository.

Suppose, your company's GitHub account's username is abc1234. And suppose your personal GitHub account's username is jack1234

And, suppose you have created two RSA keys, namely id_rsa_company and id_rsa_personal. So, your configuration file will look like below:

# Company account Host company HostName PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa_company # Personal account Host personal HostName PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa_personal

Now, when you are cloning the repository (named demo) from the company's GitHub account, the repository URL will be something like:

Repo URL:

Now, while doing git clone,...

0 0

Parent page: Internet and Networking >> SSH

Public key authentication is more secure than password authentication. This is particularly important if the computer is visible on the internet. If you don't think it's important, try logging the login attempts you get for the next week. My computer - a perfectly ordinary desktop PC - had over 4,000 attempts to guess my password and almost 2,500 break-in attempts in the last week alone.

With public key authentication, the authenticating entity has a public key and a private key. Each key is a large number with special mathematical properties. The private key is kept on the computer you log in from, while the public key is stored on the .ssh/authorized_keys file on all the computers you want to log in to. When you log in to a computer, the SSH server uses the public key to "lock" messages in a way that can only be "unlocked" by your private key - this means that even the most resourceful attacker can't snoop on, or...

0 0

You need your SSH public key and you will need your ssh private key. Keys can be generated with ssh_keygen. The private key must be kept on Server 1 and the public key must be stored on Server 2.

This is completly described in the manpage of openssh, so I will quote a lot of it. You should read the section 'Authentication'. Also the openSSH manual should be really helpful:

Please be careful with ssh because this affects the security of your server.

From man ssh:

~/.ssh/identity ~/.ssh/id_dsa ~/.ssh/id_rsa Contains the private key for authentication. These files contain sensitive data and should be readable by the user but not acces- sible by others (read/write/execute). ssh will simply ignore a private key file if it is accessible by others. It is possible to specify a passphrase when generating the key which will be used to encrypt the sensitive part of this file using 3DES. ~/.ssh/
0 0


In this tutorial you will learn how to set up SSH keys on your local device and use the generated pair of keys for connecting to a remote server. This method is more convenient and provides a more secure way of connecting to the remote server/machine than simply using a password.

Additionally, you can check out this tutorial on “How to Connect to your VPS using Putty”. It will be very helpful if you are running Windows OS and not sure how to connect to the server: How to Connect to your VPS using Putty.

[optin-monster-shortcode id="stzwvu2okxyhpualnkg8"]

What you’ll need

Before you begin this guide you’ll need the following:

Access to your local device.Access to the remote device.A terminal suitable for SSH connection.

Step 1 — Generating the SSH keys

You can generate and set up the RSA keys on Linux / Unix system using any kind of Terminal type of environment which your local device has.

After entering the...

0 0

You could do that with ssh-keygen, however, remember that the private key is meant to be private to the user so you should be very careful to keep it safe- as safe as the user's password. Or even safer, as the user is not likely to be required to change it upon first login.

ssh-keygen -f anything creates two files in the current directory. is the public key, which you could append to the user's ~/.ssh/authorized_keys on any destination server.

The other file, just called anything is the private key and therefore should be stored safely for the user. The default location would be ~username/.ssh/id_rsa (here named id_rsa, which is default for rsa keys). Remember that the .ssh directory cannot be readable or writeable by anyone but the user, and the user's home directory cannot be writeable by anyone but the user. Likewise, permissions must be tight on the private key, as well: Read/write for only the user, and the .ssh directory and private keyfile must be...

0 0
I have been at this simple thing and I know I am missing something. Some sort of combo of something. I have tried many things I found online and can not get this to work.

This is a virtual I am on:

[MYNAME@vd-MYNAME scripts]$ lsb_release -a
LSB Version: :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarchrinting-4.1-amd64rinting-4.1-noarch
Distributor ID: CentOS
Description: CentOS Linux release 7.1.1503 (Core)
Release: 7.1.1503
Codename: Core

I am trying to make this script work:

[MYNAME@vd-MYNAME scripts]$ cat ifc

read -p "Enter first SITE number: " startSITE
read -p "Enter last SITE number: " stopSITE

#ssh -i /home/MYNAME/ssh/config

for x in `seq $startSITE $stopSITE`
do for n in 1 2
do ssh -i /home/MYNAME/ssh/id_rsa root@SITE$x-n$n ifconfig eth0; done; done

And I have these files:

0 0

Use promo code DOCS10 for $10 credit on a new account.

Public key authentication provides SSH users with the convenience of logging in to their Linodes without entering their passwords. SSH keys are also more secure than passwords, because the private key used to secure the connection is never shared. Private keys can also be encrypted so their contents can’t be read as easily. While SSH passwords are not required once keys are set up, passwords for decrypting the private keys locally are still required. For added convenience, depending on your local workstation’s security, you can add the new password to your local keychain so it’s saved after the first login.

Intro to SSH Keys Authentication

SSH keys come in pairs; a private and a public key. Usually the private key is saved as ~/.ssh/id_ and the public key is ~/.ssh/ The type of encryption most often used by default is RSA, so your keys should be named id_rsa and The public key...

0 0

recently read that SSH keys provide a secure way of logging into a Linux and Unix-based server. How do I set up SSH keys on a Linux or Unix based systems? In SSH for Linux/Unix, how do I set up public key authentication?

I am assuming that you are using Linux or Unix-like server and client with the following software:

OpenSSH SSHD serverOpenSSH ssh client and friends on Linux (Ubuntu, Debian, {Free,Open,Net}BSD, RHEL, CentOS, MacOS/OSX, AIX, HP-UX and co).

What is a public key authentication?

OpenSSH server supports various authentication schema. The two most popular are as follows:

Passwords based authenticationPublic key based authentication. It is an alternative security method to using passwords. This method is recommended on a VPS, cloud, dedicated or even home based server.

How to set up SSH keys

Steps to setup secure ssh keys:

Create the key pair using ssh-keygen command.Copy and install the public key using ssh-copy-id...
0 0

If you need to generate an SSH key to make new Closed Captioning requests from your integrated system and/or computer, this article shows how to do that on Windows, using two different methods.

Generating an SSH Key on Windows - using PuTTY Gen:

Set the Parameters by selecting the SSH-2 RSA radio button, and enter 2048 for the number of bits. Click Generate and the Key generation will begin. When the Key generation is complete, save the Private part of your key on your local computer using the Save Private Key button. Do not assign a passphrase to this key for use with your AST account. Make sure you save this key in a secure location and make a note of where you save it (you will need to know this in a moment). It is not necessary to save the Public part of your key, but you may do so if you wish. Back in the PuTTY Gen window, the public key text appears in the upper pane on the window -- select all of it and copy it to your clipboard with Ctrl-C. Now, you can enroll...
0 0

Generating Your SSH Public Key

That being said, many Git servers authenticate using SSH public keys. In order to provide a public key, each user in your system must generate one if they don’t already have one. This process is similar across all operating systems. First, you should check to make sure you don’t already have a key. By default, a user’s SSH keys are stored in that user’s ~/.ssh directory. You can easily check to see if you have a key already by going to that directory and listing the contents:

$ cd ~/.ssh $ ls authorized_keys2 id_dsa known_hosts config

You’re looking for a pair of files named something like id_dsa or id_rsa and a matching file with a .pub extension. The .pub file is your public key, and the other file is your private key. If you don’t have these files (or you don’t even have a .ssh directory), you can create them by running a program called ssh-keygen, which is provided with the SSH package on Linux/Mac systems and...

0 0

How do I find my RSA key fingerprint?

Run the following command to retrieve your SSH RSA fingerprint (-l means "list" instead of create a new key, -f means "filename"):

$ ssh-keygen -lf /path/to/ssh/key

So for example, on my machine the command I ran was:

$ ssh-keygen -lf ~/.ssh/

Concrete example (if you use an RSA public key):

$ ssh-keygen -lf ~/.ssh/ 2048 00:11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff /Users/username/.ssh/ (RSA)

With newer versions of ssh-keygen, run ssh-keygen -E md5 -lf if you want the same format as old (thanks Lloyd Dewolf)

Bonus info:

ssh-keygen -lf also works on known_hosts and authorized_keys files.

Find most public on a Linux/Unix/OSX system with find /etc/ssh /home/*/.ssh /Users/*/.ssh -name '*.pub' -o -name 'authorized_keys' -o -name 'known_hosts' (If you want to see inside other users' homedirs, you'll have to be root or sudo.)

The ssh-add -l is very similar but...

0 0

If your daily activity requires loging in a lot of Linux systems through SSH, you will be happy to know (if you don't already) that there's a way to allow secure, authenticated remote access, file transfer, and command execution without having to remember passwords for each individual host you connect.

The $HOME/.ssh/authorized_keys file contains the RSA keys allowed for RSA authentication. Each line contains one key, which consists of the following fields: options, bits, exponent, modulus and comment. The first field is optional, bits, exponent and modulus fields give the RSA key and the last field isn't used at all in the authentication process, but it will be somewhat convenient to the user, for instance to know which key is for which machine.

Before we start, make sure your computer has a ssh client installed and the remote Linux system has ssh installed and sshd running, with RSA authentication enabled (RSAAuthentication yes in...

0 0