#+TITLE: Creating a SSH-key for a new user
#+AUTHOR: Worg people
#+EMAIL: mdl AT imapmail DOT org
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To push commits to the Worg repository at https://code.orgmode.org/bzg/worg you
need to have a SSH key. What's that and how can you create one?
* Public and private keys
#+index: Public key
#+index: Private key
A /public key/ is like a door lock, and a /private key/ is like the key.
=Repo.or.cz= is asking you for the /public key/, that means, they ask you
to provide a lock, and they will install your lock in their server.
Then, with your /private key/ you will be able to open a connection to
Your /private key/ may be easy to use: just /have it/, and you can use
it to open the lock.
But suppose you lose it; then it's not secure anymore; any person which
has the key (which is a file) can connect to the server supplanting your
Therefore, at the computer we do that the /private key/ has a /password/
(also called "passphrase"). Then, you do not only need to possess the
key to open the lock; you also need to know how to use it (that means,
you must have the /public key/ *and* know the password).
So: *use a passphrase* for more security.
* Steps to create your private and public keys
1. Run =ssh-keygen= with no parameters. If you want to change the
encryption algorithm used, see [[RSA or DSA?][the section below]].
2. /Location of the key/: just press enter
3. /Passphrase of the key/: enter your new password; the one you will
type each time to be able to connect. You can have no password at
all, but it's not recommended; read the description at the
introduction to know why.
4. Now you have 2 new files:
- =id_rsa=: that's your new private key. Don't share it!
- =id_rsa.pub=: that's your new /public key/. You can distribute it.
- You will also see a /fingerprint/ (like =31:c0:5a:92:70:5e:91=... etc).
5. Look at the public key. If you don't like the user name which appears
at the end, re-run =ssh-keygen -C "comment that you want" =
* RSA or DSA?
You can decide if at the key creation you want to use the algorithm RSA or
the algorithm DSA.
If you know which one you like, you're lucky; use it!
If not, decide one; both will work.
By default, =ssh-keygen= uses RSA, but you can use =ssh-keygen -t dsa= to
* Appendice: How to use this key to create an account on =repo.or.cz=?
*Note*: this section was useful when worg.git was hosted on =repo.or.cz=
instead of =orgmode.org=, before december 2011. We leave it here, so that
it is useful for other project than Worg.
1. Copy and paste the /public/ key (the contents of =id_rsa.pub=) in the
text box in http://repo.or.cz/reguser.cgi
2. In "/login/", write the user name you want to have in this server
3. Write also your e-mail
4. Click the button "/Register/"
5. Now you must ask the administrator to give you "push"-access: to
allow you to upload contents to the project.
6. If you chose a user name for =repo.or.cz= that is different than your
login name, you might adjust the ssh client to use the user name for
=repo.or.cz= name when connecting.
This can be done by putting two lines like these in the file
# Started at 11.12.2007 by Daniel Clemente. This text is in the public domain.