Several tools exist to generate SSH public/private key pairs. The following sections show how to generate an SSH key pair on UNIX, UNIX-like and Windows platforms.

Generating an SSH Key Pair on UNIX and UNIX-Like Platforms Using the ssh-keygen Utility

How to Create a Public/Private Key Pair. The standard procedure for creating a Secure Shell public/private key pair follows. For information on additional options, see ssh-keygen(1). Start the key generation program. Once you generate your key pair, you can use your public key to encrypt messages using a PKCS 1.5 algorithm and decrypt the messages using your private key. The idea behind this is that someone would use your public key to send you secret messages and only you can read these messages by decrypting with your private key. Create a key pair. To create a key pair, at a command prompt, type the following command: sn –k In this command, file name is the name of the output file containing the key pair. The following example creates a key pair called sgKey.snk. Sn -k sgKey.snk. Oct 05, 2007  Generating Keys. Generating public keys for authentication is the basic and most often used feature of ssh-keygen. Ssh-keygen can generate both RSA and DSA keys. RSA keys have a minimum key length of 768 bits and the default length is 2048. When generating new RSA keys you should use at least 2048 bits of key length unless you really have a. The RSA problem is defined as the task of taking eth roots modulo a composite n: recovering a value m such that c ≡ m e (mod n), where (n, e) is an RSA public key and c is an RSA ciphertext. Currently the most promising approach to solving the RSA problem is to factor the modulus n. Jun 23, 2012  The RSA keys are just set to NULL because their values will be initialized later when the RSA/AES functions are called. The #ifdef line certainly peaks some interest. Ets 2 activation key generator. Since this class is eventually going to be dropped in a server, it will be using the client’s public key to encrypt data, but we don’t have a client yet, so we define a fake client and generate another RSA key pair to. Oct 05, 2007 To add a comment to the public key file when generating the key add to the key generation command -C 'you comment'. For example to generate 4048 bit RSA key with “home machine” as a comment you will do the following: ssh-keygen -b 4048 -t rsa -C 'home machine'.

UNIX and UNIX-like platforms (including Solaris and Linux) include the ssh-keygen utility to generate SSH key pairs.

To generate an SSH key pair on UNIX and UNIX-like platforms using the ssh-keygen utility:
  1. Navigate to your home directory:
  2. Run the ssh-keygen utility, providing as filename your choice of file name for the private key:

    The ssh-keygen utility prompts you for a passphrase for the private key.

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  3. Enter a passphrase for the private key, or press Enter to create a private key without a passphrase:

    Note:

    While a passphrase is not required, you should specify one as a security measure to protect the private key from unauthorized use. When you specify a passphrase, a user must enter the passphrase every time the private key is used.

    The ssh-keygen utility prompts you to enter the passphrase again.

  4. Enter the passphrase again, or press Enter again to continue creating a private key without a passphrase:
  5. The ssh-keygen utility displays a message indicating that the private key has been saved as filename and the public key has been saved as filename.pub. It also displays information about the key fingerprint and randomart image.

Generating an SSH Key Pair on Windows Using the PuTTYgen Program

The PuTTYgen program is part of PuTTY, an open source networking client for the Windows platform.

To generate an SSH key pair on Windows using the PuTTYgen program:
  1. Download and install PuTTY or PuTTYgen.

    To download PuTTY or PuTTYgen, go to http://www.putty.org/ and click the You can download PuTTY here link.

  2. Run the PuTTYgen program.
  3. Set the Type of key to generate option to SSH-2 RSA.
  4. In the Number of bits in a generated key box, enter 2048.
  5. Click Generate to generate a public/private key pair.

    As the key is being generated, move the mouse around the blank area as directed.

  6. (Optional) Enter a passphrase for the private key in the Key passphrase box and reenter it in the Confirm passphrase box.

    Note:

    While a passphrase is not required, you should specify one as a security measure to protect the private key from unauthorized use. When you specify a passphrase, a user must enter the passphrase every time the private key is used.

  7. Click Save private key to save the private key to a file. To adhere to file-naming conventions, you should give the private key file an extension of .ppk (PuTTY private key).

    Note:

    The .ppk file extension indicates that the private key is in PuTTY's proprietary format. You must use a key of this format when using PuTTY as your SSH client. It cannot be used with other SSH client tools. Refer to the PuTTY documentation to convert a private key in this format to a different format.
  8. Select all of the characters in the Public key for pasting into OpenSSH authorized_keys file box.

    Make sure you select all the characters, not just the ones you can see in the narrow window. If a scroll bar is next to the characters, you aren't seeing all the characters.

  9. Right-click somewhere in the selected text and select Copy from the menu.
  10. Open a text editor and paste the characters, just as you copied them. Start at the first character in the text editor, and do not insert any line breaks.
  11. Save the text file in the same folder where you saved the private key, using the .pub extension to indicate that the file contains a public key.
  12. If you or others are going to use an SSH client that requires the OpenSSH format for private keys (such as the ssh utility on Linux), export the private key:
    1. On the Conversions menu, choose Export OpenSSH key.
    2. Save the private key in OpenSSH format in the same folder where you saved the private key in .ppk format, using an extension such as .openssh to indicate the file's content.

How to Create a Public/Private Key Pair

The standard procedure for creating a Secure Shell public/private key pair follows. For information on additional options, see ssh-keygen(1).

C Generate Rsa Key Pair Signature V1

  1. Start the key generation program.


  2. Enter the path to the file that will hold the key.

    By default, the file name id_rsa, which represents an RSA v2 key, appears in parentheses. You can select this file by pressing Return. Or, you can type an alternative filename.


    The public key name is created automatically and the string .pub is appended to the private key name.

  3. Enter a passphrase for using your key.

    This passphrase is used for encrypting your private key. A good passphrase is 10–30 characters long, mixes alphabetic and numeric characters, and avoids simple English prose and English names. A null entry means no passphrase is used, but this entry is strongly discouragedfor user accounts. Note that the passphrase is not displayed when you type it in.


  4. Re-enter the passphrase to confirm it.


  5. Check the results.

    The key fingerprint (a colon-separated series of 2 digit hexadecimal values) is displayed. Check that the path to the key is correct. In the example, the path is /home/johndoe/.ssh/id_rsa.pub. At this point, you have created a public/private key pair.

  6. Copy the public key and append the key to the $HOME/.ssh/authorized_keys file in your home directory on the remote host.