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+.\"  -*- nroff -*-
+.\"
+.\" ssh-keygen.1
+.\"
+.\" Author: Tatu Ylonen <ylo@cs.hut.fi>
+.\"
+.\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+.\"                    All rights reserved
+.\"
+.\" Created: Sat Apr 22 23:55:14 1995 ylo
+.\"
+.\" $Id: ssh-keygen.1,v 1.3 1999/10/28 23:15:49 damien Exp $
+.\"
+.Dd September 25, 1999
+.Dt SSH-KEYGEN 1
+.Os
+.Sh NAME
+.Nm ssh-keygen
+.Nd authentication key generation
+.Sh SYNOPSIS
+.Nm ssh-keygen
+.Op Fl q
+.Op Fl b Ar bits
+.Op Fl N Ar new_passphrase
+.Op Fl C Ar comment
+.Nm ssh-keygen
+.Fl p
+.Op Fl P Ar old_passphrase
+.Op Fl N Ar new_passphrase
+.Nm ssh-keygen
+.Fl c
+.Op Fl P Ar passphrase
+.Op Fl C Ar comment
+.Sh DESCRIPTION 
+.Nm
+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.
+.Pp
+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
+option.
+.Pp
+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.
+.Pp
+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
+option.
+.Pp
+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 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
+Silence
+.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.
+.El
+.Sh FILES
+.Bl -tag -width Ds
+.It Pa $HOME/.ssh/random_seed
+Used for seeding the random number generator.  This file should not be
+readable by anyone but the user.  This file is created the first time
+the program is run, and is updated every time.
+.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
+.Nm
+but it is offered as the default file for the private key.
+.It Pa $HOME/.ssh/identity.pub
+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.
+.Sh AUTHOR
+Tatu Ylonen <ylo@cs.hut.fi>
+.Pp
+OpenSSH
+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
+.It
+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.
+.It
+has been updated to support ssh protocol 1.5.
+.It
+contains added support for 
+.Xr kerberos 8
+authentication and ticket passing.
+.It
+supports one-time password authentication with
+.Xr skey 1 .
+.El
+.Pp
+The libraries described in
+.Xr ssl 8
+are required for proper operation.
+.Sh SEE ALSO
+.Xr ssh 1 ,
+.Xr ssh-add 1 ,
+.Xr ssh-agent 1,
+.Xr sshd 8 ,
+.Xr ssl 8