path: root/ssh-keygen.1
diff options
authorDamien Miller <>1999-12-27 09:23:58 +1100
committerDamien Miller <>1999-12-27 09:23:58 +1100
commitc0d739039807abaa7985112370b4c5f4e85e02d7 (patch)
tree70d1579e28003ac341dfa9330d6e1d63e8108bc2 /ssh-keygen.1
parentaae1093640162022abba350d94c3051e6d730425 (diff)
- Automatically correct paths in manpages and configuration files. Patch
and script from Andre Lucas <> - Removed credits from README to CREDITS file, updated.
Diffstat (limited to 'ssh-keygen.1')
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-.\" -*- nroff -*-
-.\" ssh-keygen.1
-.\" Author: Tatu Ylonen <>
-.\" Copyright (c) 1995 Tatu Ylonen <>, Espoo, Finland
-.\" All rights reserved
-.\" Created: Sat Apr 22 23:55:14 1995 ylo
-.\" $Id: ssh-keygen.1,v 1.6 1999/12/26 03:24:41 damien Exp $
-.Dd September 25, 1999
-.Nm ssh-keygen
-.Nd authentication key generation
-.Nm ssh-keygen
-.Op Fl q
-.Op Fl b Ar bits
-.Op Fl N Ar new_passphrase
-.Op Fl C Ar comment
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl p
-.Op Fl P Ar old_passphrase
-.Op Fl N Ar new_passphrase
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl c
-.Op Fl P Ar passphrase
-.Op Fl C Ar comment
-.Op Fl f Ar keyfile
-.Nm ssh-keygen
-.Fl l
-.Op Fl f Ar keyfile
-generates and manages authentication keys for
-.Xr ssh 1 .
-Normally each user wishing to use SSH
-with RSA authentication runs this once to create the authentication
-key in
-.Pa $HOME/.ssh/identity .
-Additionally, the system administrator may use this to generate host keys.
-Normally 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
-.Dq .pub
-appended. The program also asks for a
-passphrase. The passphrase may be empty to indicate no passphrase
-(host keys must have empty passphrase), or it may be a string of
-arbitrary length. Good passphrases are 10-30 characters long and are
-not simple sentences or otherwise easily guessable (English
-prose has only 1-2 bits of entropy per word, and provides very bad
-passphrases). The passphrase can be changed later by using the
-.Fl p
-There is no way to recover a lost passphrase. If the passphrase is
-lost or forgotten, you will have to generate a new key and copy the
-corresponding public key to other machines.
-There is also a comment field in the key file that is only for
-convenience to the user to help identify the key. The comment can
-tell what the key is for, or whatever is useful. The comment is
-initialized to
-.Dq user@host
-when the key is created, but can be changed using the
-.Fl c
-The options are as follows:
-.Bl -tag -width Ds
-.It Fl b Ar bits
-Specifies the number of bits in the key to create. Minimum is 512
-bits. Generally 1024 bits is considered sufficient, and key sizes
-above that no longer improve security but make things slower. The
-default is 1024 bits.
-.It Fl c
-Requests changing the comment in the private and public key files.
-The program will prompt for the file containing the private keys, for
-passphrase if the key has one, and for the new comment.
-.It Fl f
-Specifies the filename of the key file.
-.It Fl l
-Show fingerprint of specified private or public key file.
-.It Fl p
-Requests changing the passphrase of a private key file instead of
-creating a new private key. The program will prompt for the file
-containing the private key, for the old passphrase, and twice for the
-new passphrase.
-.It Fl q
-.Nm ssh-keygen .
-Used by
-.Pa /etc/rc
-when creating a new key.
-.It Fl C Ar comment
-Provides the new comment.
-.It Fl N Ar new_passphrase
-Provides the new passphrase.
-.It Fl P Ar passphrase
-Provides the (old) passphrase.
-.Bl -tag -width Ds
-.It Pa $HOME/.ssh/identity
-Contains the RSA authentication identity of the user. This file
-should not be readable by anyone but the user. It is possible to
-specify a passphrase when generating the key; that passphrase will be
-used to encrypt the private part of this file using 3DES. This file
-is not automatically accessed by
-but it is offered as the default file for the private key.
-.It Pa $HOME/.ssh/
-Contains the public key for authentication. The contents of this file
-should be added to
-.Pa $HOME/.ssh/authorized_keys
-on all machines
-where you wish to log in using RSA authentication. There is no
-need to keep the contents of this file secret.
-Tatu Ylonen <>
-is a derivative of the original (free) ssh 1.2.12 release, but with bugs
-removed and newer features re-added. Rapidly after the 1.2.12 release,
-newer versions bore successively more restrictive licenses. This version
-of OpenSSH
-.Bl -bullet
-has all components of a restrictive nature (ie. patents, see
-.Xr ssl 8 )
-directly removed from the source code; any licensed or patented components
-are chosen from
-external libraries.
-has been updated to support ssh protocol 1.5.
-contains added support for
-.Xr kerberos 8
-authentication and ticket passing.
-supports one-time password authentication with
-.Xr skey 1 .
-The libraries described in
-.Xr ssl 8
-are required for proper operation.
-.Xr ssh 1 ,
-.Xr ssh-add 1 ,
-.Xr ssh-agent 1 ,
-.Xr sshd 8 ,
-.Xr ssl 8