src/usr.bin/ssh/ssh-keygen.1 - diff

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Diff for /src/usr.bin/ssh/ssh-keygen.1 between version 1.14 and 1.15

version 1.14, 2000/04/26 21:55:04

version 1.15, 2000/05/02 23:33:46

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.Nd authentication key generation

.Sh SYNOPSIS

.Nm ssh-keygen

.Op Fl q

.Op Fl dq

.Op Fl b Ar bits

.Op Fl N Ar new_passphrase

.Op Fl C Ar comment

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.Nm

generates and manages authentication keys for

.Xr ssh 1 .

.Nm

defaults to generating an RSA key for use by protocols 1.3 and 1.5;

specifying the

.Fl d

flag will create a DSA key instead for use by protocol 2.0.

.Pp

Normally each user wishing to use SSH

with RSA authentication runs this once to create the authentication

with RSA or DSA authentication runs this once to create the authentication

key in

.Pa $HOME/.ssh/identity .

.Pa $HOME/.ssh/identity

Additionally, the system administrator may use this to generate host keys.

.Pa $HOME/.ssh/id_dsa .

Additionally, the system administrator may use this to generate host keys,

as seen in

.Pa /etc/rc .

.Pp

Normally this program generates the key and asks for a file in which

to store the private key.

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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

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 comment can tell what the key is for, or whatever is useful.

The comment is initialized to

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.Fl c

option.

.Pp

After a key is generated, instructions below detail where the keys

should be placed to be activated.

.Pp

The options are as follows:

.Bl -tag -width Ds

.It Fl b Ar bits

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This file is not automatically accessed by

.Nm

but it is offered as the default file for the private key.

.Xr sshd 8

will read this file when a login attempt is made.

.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.

.It Pa $HOME/.ssh/id_dsa

Contains the DSA 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.

.Xr sshd 8

will read this file when a login attempt is made.

.It Pa $HOME/.ssh/id_dsa.pub

Contains the public key for authentication.

The contents of this file should be added to

.Pa $HOME/.ssh/authorized_keys2

on all machines

where you wish to log in using DSA authentication.

There is no need to keep the contents of this file secret.

.Sh AUTHOR

Tatu Ylonen <ylo@cs.hut.fi>