Rm keygen

Rm keygen

Rm keygen

Rm keygen

ssh-keygen

ssh-keygen is a standard component of the Secure Shell (SSH) protocol suite found on Unix, Unix-like and Microsoft Windows computer systems used to establish secure shell sessions between remote computers over insecure networks, through the use of various cryptographic techniques. The ssh-keygen utility is used to generate, manage, and convert authentication keys.

Overview[edit]

ssh-keygen is able to generate a key using one of three different digital signature algorithms. With the help of the ssh-keygen tool, a user can create passphrase keys for any of these key types (to provide for unattended operation, the passphrase can be left empty, at increased risk). These keys differ from keys used by the related tool GNU Privacy Guard.

OpenSSH-based client and server programs have been included in Windows 10 since version 1803. The SSH client and key agent are enabled and available by default and the SSH server is an optional Feature-on-Demand.[1][2]

Key formats supported[edit]

ProtocolGeneration
RSA1
DSA2
ECDSA3
ed255194

Originally, with SSH protocol version 1 (now deprecated) only the RSA algorithm was supported. As of 2016, RSA is still considered strong, but the recommended key length has increased over time.

The SSH protocol version 2 additionally introduced support for the DSA algorithm. DSA is now considered weak and was disabled in OpenSSH 7.0.

Subsequently, OpenSSH added support for a third digital signature algorithm, ECDSA (this key format no longer uses the previous PEM file format for private keys, nor does it depend upon the OpenSSL library to provide the cryptographic implementation).

A fourth format is supported using ed25519, originally developed by independent cryptography researcher Daniel J. Bernstein.

ssh-keygen command syntax[edit]

The syntax of the ssh-keygen command is as follows:

ssh-keygen [options]

Some important options of the ssh-keygen command are as follows:

ssh-keygen command options description
-b bits Specifies the number of bits in the key to create. The default length is 3072 bits (RSA) or 256 bits (ECDSA).
-C comment Provides new comment.
-p Requests changing the passphrase of a private key file instead of creating a new private key.
-t Specifies the type of key to create.
-o Use the new OpenSSH format.
-q quiets ssh-keygen. It is used by the /etc/rc file while creating a new key.
-N Provides a new Passphrase.
-B Dumps the key's fingerprint in Bubble Babble format.
-l Dumps the key's fingerprint in SHA-2 (or MD5) format.

Files used by the ssh-keygen utility[edit]

The ssh-keygen utility uses various files for storing public and private keys. The files used by ssh-keygen utility are as follows:

  • $HOME/.ssh/identity: The $HOME/.ssh/identity file contains the RSA private key when using the SSH protocol version 1.
  • $HOME/.ssh/identity.pub: The $HOME/.ssh/identity.pub file contains the RSA public key for authentication when you are using the SSH protocol version 1. A user should copy its contents in the $HOME/.ssh/authorized_keys file of the remote system where a user wants to log in using RSA authentication.
  • $HOME/.ssh/id_dsa: The $HOME/.ssh/id_dsa file contains the protocol version 2 DSA authentication identity of the user.
  • $HOME/.ssh/id_dsa.pub: The $HOME/.ssh/id_dsa.pub file contains the DSA public key for authentication when you are using the SSH protocol version 2. A user should copy its contents in the $HOME/.ssh/authorized_keys file of the remote system where a user wants to log in using DSA authentication.
  • $HOME/.ssh/id_rsa: The $HOME/.ssh/id_rsa file contains the protocol version 2 RSA authentication identity of the user. This file should not be readable by anyone but the user.
  • $HOME/.ssh/id_rsa.pub: The $HOME/.ssh/id_rsa.pub file contains the protocol version 2 RSA public key for authentication. The contents of this file should be added to $HOME/.ssh/authorized_keys on all computers where a user wishes to log in using public key authentication.

References[edit]

External links[edit]

Источник: [https://torrent-igruha.org/3551-portal.html]
, Rm keygen

Updating host keys

There are three methods to remove this error. Please keep in mind that the modification to fix this needs to be performed on the client side, so if you are getting this connecting from home/work you must update that specific computer.

Method One — Generate a new host key (MAC or Linux)

If you have connected to a host in the past, the old host key is stored in your computer's /user/.ssh/known_hosts file. If the key has been updated on the server, you must now delete the old key on your computer.

Run the following command in your shell.

Change HOSTNAME to the host you're connecting to, such as example.com

[local]$ ssh-keygen -R HOSTNAME

The -R option removes the old key related to a specific hostname.

You can now connect via SSH to store a new key.

Method Two — Deleting your known_hosts file

If you log in to other servers, do not delete the known_hosts file, or you’ll have no way of knowing if your SSH keys have changed.

Delete your entire known_hosts file (on your local computer) if you have several hosts that need to be updated. On first log in, it confirms the new key.

  • On a Mac or Linux machine – the known_hosts file is located in the .ssh/known_hosts directory. You can simply run this command in a terminal to delete the known_host file:
[local]$ rm .ssh/known_hosts
  • On a Windows machine using PuTTY – you must access the registry to remove the known_hosts:
  1. Open up ‘regedit.exe’ by doing a search.
  2. Navigate to HKEY_CURRENT_USER\Software\SimonTatham\PuTTY\SshHostKeys
  3. Delete all keys in there or delete the individual host key.

Method Three — Edit the known_hosts file

Edit the known_hosts file. In the above case, open the file /home/USER/.ssh/known_hosts in the preferred text editor, and then remove the problem line.

  • This is similar to method two but rather than deleting the entire .known_hosts file, you delete the specific host line in the file instead.
  • The warning message lists the line number; it can be found after the file name in the error. In the above error message, the line number is 10,278. If you are on a Mac or Linux machine and if you are using the "vi" editor, you can simply type the following command to jump to that line:
The editor opens to that specific line. Click the ‘d’ key twice to delete that line, and then enter the following to save:

View the following article for further details on how to use vim.

On a Windows machine using PuTTY, navigate to the Registry folder as shown in method two above. In that directory, a list of hostnames appears. Right click on the one you need to remove, and then select ‘Delete’.

See also

Internal links

External links

Источник: [https://torrent-igruha.org/3551-portal.html]
Rm keygen

ssh-keygen

- authentication key generation

Synopsis

[] [ ] [] [] [] [] [] [] [ | ] [] [] [] [] [] [ | ] [] [] [] []

Description

The utility generates, manages, and converts authentication keys for (1). can create RSA keys for use by SSH protocol version 1 and RSA or DSA keys for use by SSH protocol version 2. The type of key to be generated is specified with the option. can also generate fingerprints or convert the public keys from the X.509v3 certificates specified as PKCS#11 URIs.

Normally, each user wishing to use SSH with RSA or DSA authentication runs this once to create the authentication key in , , or . The system administrator can also use this to generate host keys..

Ordinarily, this program generates the key and asks for a file in which to store the private key. The public key is stored in a file with the same name but with the ``'' extension appended. The program also asks for a passphrase. The passphrase can be empty to indicate no passphrase (host keys must have empty passphrases), or it can be a string of arbitrary length. Good passphrases are 10-30 characters long, are not simple sentences or otherwise easy to guess, and contain a mix of uppercase and lowercase letters, numbers, and non-alphanumeric characters. (English prose has only 1-2 bits of entropy per word and provides very poor passphrases.) If a passphrase is set, it must be at least 4 characters long.

The passphrase can be changed later by using the option.

There is no way to recover a lost passphrase. If the passphrase is lost or forgotten, you have to generate a new key and copy the corresponding public key to other machines.

For RSA, there is also a comment field in the key file that is only for convenience to the user to help identify the key. The can tell what the key is for, or whatever is useful. The comment is initialized to ``'' when the key is created, but can be changed using the option.

After a key is generated, instructions below detail where to place the keys to activate them.

Options

The following options are supported:

Specifies the number of bits in the key to create. The minimum number is 512 bits. Generally, 2048 bits is considered sufficient. Key sizes above that no longer improve security but make things slower. The default is 2048 bits.

Shows the bubblebabble digest of the specified private or public key file.

Requests changing the comment in the private and public key files. The program prompts for the file containing the private keys, for the passphrase if the key has one, and for the new comment.

This option only applies to () keys.

Provides the new comment.

This option reads a private or public OpenSSH key file and prints the key in a “SECSH” Public Key File Format to stdout. This option allows exporting keys for use by several other SSH implementations.

Specifies the filename of the key file.

Search for the specified in a file, listing any occurrences found. This option is useful to find hashed host names or addresses and can also be used in conjunction with the option to print found keys in a hashed format.

Hash a file. This replaces all host names and addresses with hashed representations within the specified file. The original content is moved to a file with a suffix. These hashes may be used normally by and , but they do not reveal identifying information should the file's contents be disclosed. This option does not modify existing hashed host names and is therefore safe to use on files that mix hashed and non-hashed names.

This option reads an unencrypted private (or public) key file in SSH2-compatible format and prints an OpenSSH compatible private (or public) key to stdout. also reads the “SECSH” Public Key File Format. This option allows importing keys from several other SSH implementations.

Shows the fingerprint of the specified private or public key file.

Provides the new passphrase.

Requests changing the passphrase of a private key file instead of creating a new private key. The program prompts for the file containing the private key, for the old passphrase, and prompts twice for the new passphrase.

Provides the (old) passphrase.

Silences .

Specifies the algorithm used for the key, where is one of , , and . Type is used only for the SSHv1 protocol.

Removes all keys belonging to from a file. This option is useful to delete hashed hosts. See .

Obsolete. Replaced by the option.

Obsolete. Replaced by the option.

This option reads a private OpenSSH format file and prints an OpenSSH public key to stdout.

Exit Status

The following exit values are returned:

Successful completion.

An error occurred.

Files

This file contains the RSA private key for the SSHv1 protocol. This file should not be readable by anyone but the user. It is possible to specify a passphrase when generating the key; that passphrase is used to encrypt the private part of this file using 128–bit AES. This file is not automatically accessed by , but it is offered as the default file for the private key. (1M) reads this file when a login attempt is made.

This file contains the RSA public key for the SSHv1 protocol. The contents of this file should be added to on all machines where you wish to log in using RSA authentication. There is no need to keep the contents of this file secret.

These files contain, respectively, the DSA or RSA private key for the SSHv2 protocol. These files should not be readable by anyone but the user. It is possible to specify a passphrase when generating the key; that passphrase is used to encrypt the private part of the file using 3DES. Neither of these files is automatically accessed by but is offered as the default file for the private key. (1M) reads this file when a login attempt is made.

These files contain, respectively, the DSA or RSA public key for the SSHv2 protocol. The contents of these files should be added, respectively, to on all machines where you wish to log in using DSA or RSA authentication. There is no need to keep the contents of these files secret.

Attributes

See (5) for descriptions of the following attributes:

See Also

(1), (1), (1), (1M), (5)

Copyright © 2011, Oracle and/or its affiliates. All rights reserved. Legal Notices
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